[TASK]
You will be given four numbers and a target number, your task is to find a way to use all four numbers exactly once, along with the basic operations (+, -, *, /), to reach the target number.

[RULES]
- You can use each number exactly once.
- You can use the four basic operations (+, -, *, /).
- The intermediate results must be integers (no decimals allowed).
- The intermediate results must be positive.
- The intermediate results will not exceed 2000.

[APPROACH]
We will solve the problem by searching. Starting from a given set of four numbers, we will follow this search process:
- At each state, we will consider all possible number pairs (in order) from the current number set. Choose one pair and apply one of the four basic operations to them to obtain a new number.
  * If there are still numbers left, we will add the new number to the number set and continue the search.
  * If we have used all numbers, we will check if the new number is equal to the target number. If it is, we have found the solution. Otherwise, we will backtrack.
- Suppose the two numbers we choose are a and b (where a >= b). We will try the four options (a + b), (a - b), (a * b), (a / b) to obtain the new number. Remember to always use the larger number as the first operand.
- If the new number is a decimal, or exceeds the maximum intermediate result, we will discard this branch and backtrack.
- We will continue this process until we reach the target number with four numbers used or exhaust all possible combinations.

[EXAMPLES]
# Example
Numbers: [40, 19, 23, 7]
Target: 29

# Search Procedure
Initial number set: [40, 19, 23, 7], target: 29. Options for choosing two numbers: [(40, 19), (40, 23), (40, 7), (19, 23), (19, 7), (23, 7)].
 |- Pick two numbers (40, 19) (numbers left: [23, 7]). Try possible operations.
  |- Try 40 + 19 = 59. Add 59 to the number set. Current number set: [59, 23, 7], target: 29. Options for choosing two numbers: [(59, 23), (59, 7), (23, 7)].
   |- Pick two numbers (59, 23) (numbers left: [7]). Try possible operations.
    |- Try 59 + 23 = 82. Add 82 to the number set. Current number set: [82, 7], target: 29, just two numbers left.
     |- Try 82 + 7 = 89. Evaluate 89 != 29, drop this branch.
     |- Try 82 - 7 = 75. Evaluate 75 != 29, drop this branch.
     |- Try 82 * 7 = 574. Evaluate 574 != 29, drop this branch.
     |- Try 82 / 7 = 11.7. 11.7 is a decimal, drop this branch.
    |- Try 59 - 23 = 36. Add 36 to the number set. Current number set: [36, 7], target: 29, just two numbers left.
     |- Try 36 + 7 = 43. Evaluate 43 != 29, drop this branch.
     |- Try 36 - 7 = 29. Evaluate 29 == 29, target found!

Now we have found the target, let's trace back the solution:
Final step: 36 - 7 = 29
The step before: 59 - 23 = 36
The first step: 40 + 19 = 59

Output the solution in the required format:
<Solution>
40 + 19 = 59
59 - 23 = 36
36 - 7 = 29
</Solution>

# Example
Numbers: [9, 16, 6, 18]
Target: 12

# Search Procedure
Initial number set: [9, 16, 6, 18], target: 12. Options for choosing two numbers: [(9, 16), (9, 6), (9, 18), (16, 6), (16, 18), (6, 18)].
 |- Pick two numbers (9, 16) (numbers left: [6, 18]). Try possible operations.
  |- Try 16 + 9 = 25. Add 25 to the number set. Current number set: [25, 6, 18], target: 12. Options for choosing two numbers: [(25, 6), (25, 18), (6, 18)].
   |- Pick two numbers (25, 6) (numbers left: [18]). Try possible operations.
    |- Try 25 + 6 = 31. Add 31 to the number set. Current number set: [31, 18], target: 12, just two numbers left.
     |- Try 31 + 18 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 31 - 18 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 31 * 18 = 558. Evaluate 558 != 12, drop this branch.
     |- Try 31 / 18 = 1.7. 1.7 is a decimal, drop this branch.
    |- Try 25 - 6 = 19. Add 19 to the number set. Current number set: [19, 18], target: 12, just two numbers left.
     |- Try 19 + 18 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 19 - 18 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 19 * 18 = 342. Evaluate 342 != 12, drop this branch.
     |- Try 19 / 18 = 1.1. 1.1 is a decimal, drop this branch.
    |- Try 25 * 6 = 150. Add 150 to the number set. Current number set: [150, 18], target: 12, just two numbers left.
     |- Try 150 + 18 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 150 - 18 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 150 * 18 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 150 / 18 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 25 / 6 = 4.2. 4.2 is a decimal, drop this branch.
   |- Pick two numbers (25, 18) (numbers left: [6]). Try possible operations.
    |- Try 25 + 18 = 43. Add 43 to the number set. Current number set: [43, 6], target: 12, just two numbers left.
     |- Try 43 + 6 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 43 - 6 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 43 * 6 = 258. Evaluate 258 != 12, drop this branch.
     |- Try 43 / 6 = 7.2. 7.2 is a decimal, drop this branch.
    |- Try 25 - 18 = 7. Add 7 to the number set. Current number set: [7, 6], target: 12, just two numbers left.
     |- Try 7 + 6 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 7 - 6 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 7 * 6 = 42. Evaluate 42 != 12, drop this branch.
     |- Try 7 / 6 = 1.2. 1.2 is a decimal, drop this branch.
    |- Try 25 * 18 = 450. Add 450 to the number set. Current number set: [450, 6], target: 12, just two numbers left.
     |- Try 450 + 6 = 456. Evaluate 456 != 12, drop this branch.
     |- Try 450 - 6 = 444. Evaluate 444 != 12, drop this branch.
     |- Try 450 * 6 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 450 / 6 = 75. Evaluate 75 != 12, drop this branch.
    |- Try 25 / 18 = 1.4. 1.4 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [25]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 25], target: 12, just two numbers left.
     |- Try 25 + 24 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 25 - 24 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 25 * 24 = 600. Evaluate 600 != 12, drop this branch.
     |- Try 25 / 24 = 1.0. 1.0 is a decimal, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 25], target: 12, just two numbers left.
     |- Try 25 + 12 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 25 - 12 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 25 * 12 = 300. Evaluate 300 != 12, drop this branch.
     |- Try 25 / 12 = 2.1. 2.1 is a decimal, drop this branch.
    |- Try 18 * 6 = 108. Add 108 to the number set. Current number set: [108, 25], target: 12, just two numbers left.
     |- Try 108 + 25 = 133. Evaluate 133 != 12, drop this branch.
     |- Try 108 - 25 = 83. Evaluate 83 != 12, drop this branch.
     |- Try 108 * 25 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 108 / 25 = 4.3. 4.3 is a decimal, drop this branch.
    |- Try 18 / 6 = 3. Add 3 to the number set. Current number set: [3, 25], target: 12, just two numbers left.
     |- Try 25 + 3 = 28. Evaluate 28 != 12, drop this branch.
     |- Try 25 - 3 = 22. Evaluate 22 != 12, drop this branch.
     |- Try 25 * 3 = 75. Evaluate 75 != 12, drop this branch.
     |- Try 25 / 3 = 8.3. 8.3 is a decimal, drop this branch.
  |- Try 16 - 9 = 7. Add 7 to the number set. Current number set: [7, 6, 18], target: 12. Options for choosing two numbers: [(7, 6), (7, 18), (6, 18)].
   |- Pick two numbers (7, 6) (numbers left: [18]). Try possible operations.
    |- Try 7 + 6 = 13. Add 13 to the number set. Current number set: [13, 18], target: 12, just two numbers left.
     |- Try 18 + 13 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 18 - 13 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 18 * 13 = 234. Evaluate 234 != 12, drop this branch.
     |- Try 18 / 13 = 1.4. 1.4 is a decimal, drop this branch.
    |- Try 7 - 6 = 1. Add 1 to the number set. Current number set: [1, 18], target: 12, just two numbers left.
     |- Try 18 + 1 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 18 - 1 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 18 * 1 = 18. Evaluate 18 != 12, drop this branch.
     |- Try 18 / 1 = 18. Evaluate 18 != 12, drop this branch.
    |- Try 7 * 6 = 42. Add 42 to the number set. Current number set: [42, 18], target: 12, just two numbers left.
     |- Try 42 + 18 = 60. Evaluate 60 != 12, drop this branch.
     |- Try 42 - 18 = 24. Evaluate 24 != 12, drop this branch.
     |- Try 42 * 18 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 42 / 18 = 2.3. 2.3 is a decimal, drop this branch.
    |- Try 7 / 6 = 1.2. 1.2 is a decimal, drop this branch.
   |- Pick two numbers (7, 18) (numbers left: [6]). Try possible operations.
    |- Try 18 + 7 = 25. Add 25 to the number set. Current number set: [25, 6], target: 12, just two numbers left.
     |- Try 25 + 6 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 25 - 6 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 25 * 6 = 150. Evaluate 150 != 12, drop this branch.
     |- Try 25 / 6 = 4.2. 4.2 is a decimal, drop this branch.
    |- Try 18 - 7 = 11. Add 11 to the number set. Current number set: [11, 6], target: 12, just two numbers left.
     |- Try 11 + 6 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 11 - 6 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 11 * 6 = 66. Evaluate 66 != 12, drop this branch.
     |- Try 11 / 6 = 1.8. 1.8 is a decimal, drop this branch.
    |- Try 18 * 7 = 126. Add 126 to the number set. Current number set: [126, 6], target: 12, just two numbers left.
     |- Try 126 + 6 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 126 - 6 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 126 * 6 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 126 / 6 = 21. Evaluate 21 != 12, drop this branch.
    |- Try 18 / 7 = 2.6. 2.6 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [7]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 7], target: 12, just two numbers left.
     |- Try 24 + 7 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 24 - 7 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 24 * 7 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 24 / 7 = 3.4. 3.4 is a decimal, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 7], target: 12, just two numbers left.
     |- Try 12 + 7 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 12 - 7 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 12 * 7 = 84. Evaluate 84 != 12, drop this branch.
     |- Try 12 / 7 = 1.7. 1.7 is a decimal, drop this branch.
    |- Try 18 * 6 = 108. Add 108 to the number set. Current number set: [108, 7], target: 12, just two numbers left.
     |- Try 108 + 7 = 115. Evaluate 115 != 12, drop this branch.
     |- Try 108 - 7 = 101. Evaluate 101 != 12, drop this branch.
     |- Try 108 * 7 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 108 / 7 = 15.4. 15.4 is a decimal, drop this branch.
    |- Try 18 / 6 = 3. Add 3 to the number set. Current number set: [3, 7], target: 12, just two numbers left.
     |- Try 7 + 3 = 10. Evaluate 10 != 12, drop this branch.
     |- Try 7 - 3 = 4. Evaluate 4 != 12, drop this branch.
     |- Try 7 * 3 = 21. Evaluate 21 != 12, drop this branch.
     |- Try 7 / 3 = 2.3. 2.3 is a decimal, drop this branch.
  |- Try 16 * 9 = 144. Add 144 to the number set. Current number set: [144, 6, 18], target: 12. Options for choosing two numbers: [(144, 6), (144, 18), (6, 18)].
   |- Pick two numbers (144, 6) (numbers left: [18]). Try possible operations.
    |- Try 144 + 6 = 150. Add 150 to the number set. Current number set: [150, 18], target: 12, just two numbers left.
     |- Try 150 + 18 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 150 - 18 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 150 * 18 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 150 / 18 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 144 - 6 = 138. Add 138 to the number set. Current number set: [138, 18], target: 12, just two numbers left.
     |- Try 138 + 18 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 138 - 18 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 138 * 18 = 2484. 2484 exceeds the maximum intermediate result, drop this branch.
     |- Try 138 / 18 = 7.7. 7.7 is a decimal, drop this branch.
    |- Try 144 * 6 = 864. Add 864 to the number set. Current number set: [864, 18], target: 12, just two numbers left.
     |- Try 864 + 18 = 882. Evaluate 882 != 12, drop this branch.
     |- Try 864 - 18 = 846. Evaluate 846 != 12, drop this branch.
     |- Try 864 * 18 = 15552. 15552 exceeds the maximum intermediate result, drop this branch.
     |- Try 864 / 18 = 48. Evaluate 48 != 12, drop this branch.
    |- Try 144 / 6 = 24. Add 24 to the number set. Current number set: [24, 18], target: 12, just two numbers left.
     |- Try 24 + 18 = 42. Evaluate 42 != 12, drop this branch.
     |- Try 24 - 18 = 6. Evaluate 6 != 12, drop this branch.
     |- Try 24 * 18 = 432. Evaluate 432 != 12, drop this branch.
     |- Try 24 / 18 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (144, 18) (numbers left: [6]). Try possible operations.
    |- Try 144 + 18 = 162. Add 162 to the number set. Current number set: [162, 6], target: 12, just two numbers left.
     |- Try 162 + 6 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 162 - 6 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 162 * 6 = 972. Evaluate 972 != 12, drop this branch.
     |- Try 162 / 6 = 27. Evaluate 27 != 12, drop this branch.
    |- Try 144 - 18 = 126. Add 126 to the number set. Current number set: [126, 6], target: 12, just two numbers left.
     |- Try 126 + 6 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 126 - 6 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 126 * 6 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 126 / 6 = 21. Evaluate 21 != 12, drop this branch.
    |- Try 144 * 18 = 2592. 2592 exceeds the maximum intermediate result, drop this branch.
    |- Try 144 / 18 = 8. Add 8 to the number set. Current number set: [8, 6], target: 12, just two numbers left.
     |- Try 8 + 6 = 14. Evaluate 14 != 12, drop this branch.
     |- Try 8 - 6 = 2. Evaluate 2 != 12, drop this branch.
     |- Try 8 * 6 = 48. Evaluate 48 != 12, drop this branch.
     |- Try 8 / 6 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [144]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 144], target: 12, just two numbers left.
     |- Try 144 + 24 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 144 - 24 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 144 * 24 = 3456. 3456 exceeds the maximum intermediate result, drop this branch.
     |- Try 144 / 24 = 6. Evaluate 6 != 12, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 144], target: 12, just two numbers left.
     |- Try 144 + 12 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 144 - 12 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 144 * 12 = 1728. Evaluate 1728 != 12, drop this branch.
     |- Try 144 / 12 = 12. Evaluate 12 == 12, target found!

Now we have found the target, let's trace back the solution:
Final step: 144 / 12 = 12
The step before: 18 - 6 = 12
The first step: 16 * 9 = 144

Output the solution in the required format:
<Solution>
16 * 9 = 144
18 - 6 = 12
144 / 12 = 12
</Solution>

[Problem]
Now, solve the following problem. Note that:
- Please carefully read the approach and examples provided above, and follow them to solve the problem.
- Please ALWAYS include your search procedure (after # Search Procedure). The search procedure should follow the format of the examples provided above.
- Please mark your answer with <Solution> and </Solution> tags. The solution should be a sequence of three equations exactly following the format of the examples above, with no additional text in between.

Numbers: [28, 13, 32, 41]
Target: 31

# Search Procedure
Initial number set: [28, 13, 32, 41], target: 31. Options for choosing two numbers: [(28, 13), (28, 32), (28, 41), (13, 32), (13, 41), (32, 41)].
 |- Pick two numbers (28, 13) (numbers left: [32, 41]). Try possible operations.
  |- Try 28 + 13 = 41. Add 41 to the number set. Current number set: [41, 32, 41], target: 31. Options for choosing two numbers: [(41, 32), (41, 41), (32, 41)].
   |- Pick two numbers (41, 32) (numbers left: [41]). Try possible operations.
    |- Try 41 + 32 = 73. Add 73 to the number set. Current number set: [73, 41], target: 31, just two numbers left.
     |- Try 73 + 41 = 114. Evaluate 114 != 31, drop this branch.
     |- Try 73 - 41 = 32. Evaluate 32 != 31, drop this branch.
     |- Try 73 * 41 = 2993. 2993 exceeds the maximum intermediate result, drop this branch.
     |- Try 73 / 41 = 1.8. 1.8 is a decimal, drop this branch.
    |- Try 41 - 32 = 9. Add 9 to the number set. Current number set: [9, 41], target: 31, just two numbers left.
     |- Try 41 + 9 = 50. Evaluate 50 != 31, drop this branch.
     |- Try 41 - 9 = 32. Evaluate 32 != 31, drop this branch.
     |- Try 41 * 9 = 369. Evaluate 369 != 31, drop this branch.
     |- Try 41 / 9 = 4.6. 4.6 is a decimal, drop this branch.
    |- Try 41 * 32 = 1312. Add 1312 to the number set. Current number set: [1312, 41], target: 31, just two numbers left.
     |- Try 1312 + 41 = 1353. Evaluate 1353 != 31, drop this branch.
     |- Try 1312 - 41 = 1271. Evaluate 1271 != 31, drop this branch.
     |- Try 1312 * 41 = 53792. 53792 exceeds the maximum intermediate result, drop this branch.
     |- Try 1312 / 41 = 32. Evaluate 32 != 31, drop this branch.
    |- Try 41 / 32 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (41, 41) (numbers left: [32]). Try possible operations.
    |- Try 41 + 41 = 82. Add 82 to the number set. Current number set: [82, 32], target: 31, just two numbers left.
     |- Try 82 + 32 = 114. Evaluate 114 != 31, drop this branch.
     |- Try 82 - 32 = 50. Evaluate 50 != 31, drop this branch.
     |- Try 82 * 32 = 2624. 2624 exceeds the maximum intermediate result, drop this branch.
     |- Try 82 / 32 = 2.6. 2.6 is a decimal, drop this branch.
    |- Try 41 - 41 = 0. Add 0 to the number set. Current number set: [0, 32], target: 31, just two numbers left.
     |- Try 32 + 0 = 32. Evaluate 32 != 31, drop this branch.
     |- Try 32 - 0 = 32. Evaluate 32 != 31, drop this branch.
     |- Try 32 * 0 = 0. Evaluate 0 != 31, drop this branch.
     |- Try 32 / 0 (invalid operation). drop this branch.
    |- Try 41 * 41 = 1681. Add 1681 to the number set. Current number set: [1681, 32], target: 31, just two numbers left.
     |- Try 1681 + 32 = 1713. Evaluate 1713 != 31, drop this branch.
     |- Try 1681 - 32 = 1649. Evaluate 1649 != 31, drop this branch.
     |- Try 1681 * 32 = 53792. 53792 exceeds the maximum intermediate result, drop this branch.
     |- Try 1681 / 32 = 52.5. 52.5 is a decimal, drop this branch.
    |- Try 41 / 41 = 1. Add 1 to the number set. Current number set: [1, 32], target: 31, just two numbers left.
     |- Try 32 + 1 = 33. Evaluate 33 != 31, drop this branch.
     |- Try 32 - 1 = 31. Evaluate 31 == 31, target found!

Now we have found the target, let's trace back the solution:
Final step: 32 - 1 = 31
The step before: 41 / 41 = 1
The first step: 28 + 13 = 41

Output the solution in the required format:
<Solution>
28 + 13 = 41
41 / 41 = 1
32 - 1 = 31
</Solution>

Solution:
28 + 13 = 41
41 / 41 = 1
32 - 1 = 31


[TASK]
You will be given four numbers and a target number, your task is to find a way to use all four numbers exactly once, along with the basic operations (+, -, *, /), to reach the target number.

[RULES]
- You can use each number exactly once.
- You can use the four basic operations (+, -, *, /).
- The intermediate results must be integers (no decimals allowed).
- The intermediate results must be positive.
- The intermediate results will not exceed 2000.

[APPROACH]
We will solve the problem by searching. Starting from a given set of four numbers, we will follow this search process:
- At each state, we will consider all possible number pairs (in order) from the current number set. Choose one pair and apply one of the four basic operations to them to obtain a new number.
  * If there are still numbers left, we will add the new number to the number set and continue the search.
  * If we have used all numbers, we will check if the new number is equal to the target number. If it is, we have found the solution. Otherwise, we will backtrack.
- Suppose the two numbers we choose are a and b (where a >= b). We will try the four options (a + b), (a - b), (a * b), (a / b) to obtain the new number. Remember to always use the larger number as the first operand.
- If the new number is a decimal, or exceeds the maximum intermediate result, we will discard this branch and backtrack.
- We will continue this process until we reach the target number with four numbers used or exhaust all possible combinations.

[EXAMPLES]
# Example
Numbers: [40, 19, 23, 7]
Target: 29

# Search Procedure
Initial number set: [40, 19, 23, 7], target: 29. Options for choosing two numbers: [(40, 19), (40, 23), (40, 7), (19, 23), (19, 7), (23, 7)].
 |- Pick two numbers (40, 19) (numbers left: [23, 7]). Try possible operations.
  |- Try 40 + 19 = 59. Add 59 to the number set. Current number set: [59, 23, 7], target: 29. Options for choosing two numbers: [(59, 23), (59, 7), (23, 7)].
   |- Pick two numbers (59, 23) (numbers left: [7]). Try possible operations.
    |- Try 59 + 23 = 82. Add 82 to the number set. Current number set: [82, 7], target: 29, just two numbers left.
     |- Try 82 + 7 = 89. Evaluate 89 != 29, drop this branch.
     |- Try 82 - 7 = 75. Evaluate 75 != 29, drop this branch.
     |- Try 82 * 7 = 574. Evaluate 574 != 29, drop this branch.
     |- Try 82 / 7 = 11.7. 11.7 is a decimal, drop this branch.
    |- Try 59 - 23 = 36. Add 36 to the number set. Current number set: [36, 7], target: 29, just two numbers left.
     |- Try 36 + 7 = 43. Evaluate 43 != 29, drop this branch.
     |- Try 36 - 7 = 29. Evaluate 29 == 29, target found!

Now we have found the target, let's trace back the solution:
Final step: 36 - 7 = 29
The step before: 59 - 23 = 36
The first step: 40 + 19 = 59

Output the solution in the required format:
<Solution>
40 + 19 = 59
59 - 23 = 36
36 - 7 = 29
</Solution>

# Example
Numbers: [9, 16, 6, 18]
Target: 12

# Search Procedure
Initial number set: [9, 16, 6, 18], target: 12. Options for choosing two numbers: [(9, 16), (9, 6), (9, 18), (16, 6), (16, 18), (6, 18)].
 |- Pick two numbers (9, 16) (numbers left: [6, 18]). Try possible operations.
  |- Try 16 + 9 = 25. Add 25 to the number set. Current number set: [25, 6, 18], target: 12. Options for choosing two numbers: [(25, 6), (25, 18), (6, 18)].
   |- Pick two numbers (25, 6) (numbers left: [18]). Try possible operations.
    |- Try 25 + 6 = 31. Add 31 to the number set. Current number set: [31, 18], target: 12, just two numbers left.
     |- Try 31 + 18 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 31 - 18 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 31 * 18 = 558. Evaluate 558 != 12, drop this branch.
     |- Try 31 / 18 = 1.7. 1.7 is a decimal, drop this branch.
    |- Try 25 - 6 = 19. Add 19 to the number set. Current number set: [19, 18], target: 12, just two numbers left.
     |- Try 19 + 18 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 19 - 18 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 19 * 18 = 342. Evaluate 342 != 12, drop this branch.
     |- Try 19 / 18 = 1.1. 1.1 is a decimal, drop this branch.
    |- Try 25 * 6 = 150. Add 150 to the number set. Current number set: [150, 18], target: 12, just two numbers left.
     |- Try 150 + 18 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 150 - 18 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 150 * 18 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 150 / 18 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 25 / 6 = 4.2. 4.2 is a decimal, drop this branch.
   |- Pick two numbers (25, 18) (numbers left: [6]). Try possible operations.
    |- Try 25 + 18 = 43. Add 43 to the number set. Current number set: [43, 6], target: 12, just two numbers left.
     |- Try 43 + 6 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 43 - 6 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 43 * 6 = 258. Evaluate 258 != 12, drop this branch.
     |- Try 43 / 6 = 7.2. 7.2 is a decimal, drop this branch.
    |- Try 25 - 18 = 7. Add 7 to the number set. Current number set: [7, 6], target: 12, just two numbers left.
     |- Try 7 + 6 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 7 - 6 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 7 * 6 = 42. Evaluate 42 != 12, drop this branch.
     |- Try 7 / 6 = 1.2. 1.2 is a decimal, drop this branch.
    |- Try 25 * 18 = 450. Add 450 to the number set. Current number set: [450, 6], target: 12, just two numbers left.
     |- Try 450 + 6 = 456. Evaluate 456 != 12, drop this branch.
     |- Try 450 - 6 = 444. Evaluate 444 != 12, drop this branch.
     |- Try 450 * 6 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 450 / 6 = 75. Evaluate 75 != 12, drop this branch.
    |- Try 25 / 18 = 1.4. 1.4 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [25]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 25], target: 12, just two numbers left.
     |- Try 25 + 24 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 25 - 24 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 25 * 24 = 600. Evaluate 600 != 12, drop this branch.
     |- Try 25 / 24 = 1.0. 1.0 is a decimal, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 25], target: 12, just two numbers left.
     |- Try 25 + 12 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 25 - 12 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 25 * 12 = 300. Evaluate 300 != 12, drop this branch.
     |- Try 25 / 12 = 2.1. 2.1 is a decimal, drop this branch.
    |- Try 18 * 6 = 108. Add 108 to the number set. Current number set: [108, 25], target: 12, just two numbers left.
     |- Try 108 + 25 = 133. Evaluate 133 != 12, drop this branch.
     |- Try 108 - 25 = 83. Evaluate 83 != 12, drop this branch.
     |- Try 108 * 25 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 108 / 25 = 4.3. 4.3 is a decimal, drop this branch.
    |- Try 18 / 6 = 3. Add 3 to the number set. Current number set: [3, 25], target: 12, just two numbers left.
     |- Try 25 + 3 = 28. Evaluate 28 != 12, drop this branch.
     |- Try 25 - 3 = 22. Evaluate 22 != 12, drop this branch.
     |- Try 25 * 3 = 75. Evaluate 75 != 12, drop this branch.
     |- Try 25 / 3 = 8.3. 8.3 is a decimal, drop this branch.
  |- Try 16 - 9 = 7. Add 7 to the number set. Current number set: [7, 6, 18], target: 12. Options for choosing two numbers: [(7, 6), (7, 18), (6, 18)].
   |- Pick two numbers (7, 6) (numbers left: [18]). Try possible operations.
    |- Try 7 + 6 = 13. Add 13 to the number set. Current number set: [13, 18], target: 12, just two numbers left.
     |- Try 18 + 13 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 18 - 13 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 18 * 13 = 234. Evaluate 234 != 12, drop this branch.
     |- Try 18 / 13 = 1.4. 1.4 is a decimal, drop this branch.
    |- Try 7 - 6 = 1. Add 1 to the number set. Current number set: [1, 18], target: 12, just two numbers left.
     |- Try 18 + 1 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 18 - 1 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 18 * 1 = 18. Evaluate 18 != 12, drop this branch.
     |- Try 18 / 1 = 18. Evaluate 18 != 12, drop this branch.
    |- Try 7 * 6 = 42. Add 42 to the number set. Current number set: [42, 18], target: 12, just two numbers left.
     |- Try 42 + 18 = 60. Evaluate 60 != 12, drop this branch.
     |- Try 42 - 18 = 24. Evaluate 24 != 12, drop this branch.
     |- Try 42 * 18 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 42 / 18 = 2.3. 2.3 is a decimal, drop this branch.
    |- Try 7 / 6 = 1.2. 1.2 is a decimal, drop this branch.
   |- Pick two numbers (7, 18) (numbers left: [6]). Try possible operations.
    |- Try 18 + 7 = 25. Add 25 to the number set. Current number set: [25, 6], target: 12, just two numbers left.
     |- Try 25 + 6 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 25 - 6 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 25 * 6 = 150. Evaluate 150 != 12, drop this branch.
     |- Try 25 / 6 = 4.2. 4.2 is a decimal, drop this branch.
    |- Try 18 - 7 = 11. Add 11 to the number set. Current number set: [11, 6], target: 12, just two numbers left.
     |- Try 11 + 6 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 11 - 6 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 11 * 6 = 66. Evaluate 66 != 12, drop this branch.
     |- Try 11 / 6 = 1.8. 1.8 is a decimal, drop this branch.
    |- Try 18 * 7 = 126. Add 126 to the number set. Current number set: [126, 6], target: 12, just two numbers left.
     |- Try 126 + 6 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 126 - 6 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 126 * 6 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 126 / 6 = 21. Evaluate 21 != 12, drop this branch.
    |- Try 18 / 7 = 2.6. 2.6 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [7]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 7], target: 12, just two numbers left.
     |- Try 24 + 7 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 24 - 7 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 24 * 7 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 24 / 7 = 3.4. 3.4 is a decimal, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 7], target: 12, just two numbers left.
     |- Try 12 + 7 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 12 - 7 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 12 * 7 = 84. Evaluate 84 != 12, drop this branch.
     |- Try 12 / 7 = 1.7. 1.7 is a decimal, drop this branch.
    |- Try 18 * 6 = 108. Add 108 to the number set. Current number set: [108, 7], target: 12, just two numbers left.
     |- Try 108 + 7 = 115. Evaluate 115 != 12, drop this branch.
     |- Try 108 - 7 = 101. Evaluate 101 != 12, drop this branch.
     |- Try 108 * 7 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 108 / 7 = 15.4. 15.4 is a decimal, drop this branch.
    |- Try 18 / 6 = 3. Add 3 to the number set. Current number set: [3, 7], target: 12, just two numbers left.
     |- Try 7 + 3 = 10. Evaluate 10 != 12, drop this branch.
     |- Try 7 - 3 = 4. Evaluate 4 != 12, drop this branch.
     |- Try 7 * 3 = 21. Evaluate 21 != 12, drop this branch.
     |- Try 7 / 3 = 2.3. 2.3 is a decimal, drop this branch.
  |- Try 16 * 9 = 144. Add 144 to the number set. Current number set: [144, 6, 18], target: 12. Options for choosing two numbers: [(144, 6), (144, 18), (6, 18)].
   |- Pick two numbers (144, 6) (numbers left: [18]). Try possible operations.
    |- Try 144 + 6 = 150. Add 150 to the number set. Current number set: [150, 18], target: 12, just two numbers left.
     |- Try 150 + 18 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 150 - 18 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 150 * 18 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 150 / 18 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 144 - 6 = 138. Add 138 to the number set. Current number set: [138, 18], target: 12, just two numbers left.
     |- Try 138 + 18 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 138 - 18 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 138 * 18 = 2484. 2484 exceeds the maximum intermediate result, drop this branch.
     |- Try 138 / 18 = 7.7. 7.7 is a decimal, drop this branch.
    |- Try 144 * 6 = 864. Add 864 to the number set. Current number set: [864, 18], target: 12, just two numbers left.
     |- Try 864 + 18 = 882. Evaluate 882 != 12, drop this branch.
     |- Try 864 - 18 = 846. Evaluate 846 != 12, drop this branch.
     |- Try 864 * 18 = 15552. 15552 exceeds the maximum intermediate result, drop this branch.
     |- Try 864 / 18 = 48. Evaluate 48 != 12, drop this branch.
    |- Try 144 / 6 = 24. Add 24 to the number set. Current number set: [24, 18], target: 12, just two numbers left.
     |- Try 24 + 18 = 42. Evaluate 42 != 12, drop this branch.
     |- Try 24 - 18 = 6. Evaluate 6 != 12, drop this branch.
     |- Try 24 * 18 = 432. Evaluate 432 != 12, drop this branch.
     |- Try 24 / 18 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (144, 18) (numbers left: [6]). Try possible operations.
    |- Try 144 + 18 = 162. Add 162 to the number set. Current number set: [162, 6], target: 12, just two numbers left.
     |- Try 162 + 6 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 162 - 6 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 162 * 6 = 972. Evaluate 972 != 12, drop this branch.
     |- Try 162 / 6 = 27. Evaluate 27 != 12, drop this branch.
    |- Try 144 - 18 = 126. Add 126 to the number set. Current number set: [126, 6], target: 12, just two numbers left.
     |- Try 126 + 6 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 126 - 6 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 126 * 6 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 126 / 6 = 21. Evaluate 21 != 12, drop this branch.
    |- Try 144 * 18 = 2592. 2592 exceeds the maximum intermediate result, drop this branch.
    |- Try 144 / 18 = 8. Add 8 to the number set. Current number set: [8, 6], target: 12, just two numbers left.
     |- Try 8 + 6 = 14. Evaluate 14 != 12, drop this branch.
     |- Try 8 - 6 = 2. Evaluate 2 != 12, drop this branch.
     |- Try 8 * 6 = 48. Evaluate 48 != 12, drop this branch.
     |- Try 8 / 6 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [144]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 144], target: 12, just two numbers left.
     |- Try 144 + 24 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 144 - 24 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 144 * 24 = 3456. 3456 exceeds the maximum intermediate result, drop this branch.
     |- Try 144 / 24 = 6. Evaluate 6 != 12, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 144], target: 12, just two numbers left.
     |- Try 144 + 12 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 144 - 12 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 144 * 12 = 1728. Evaluate 1728 != 12, drop this branch.
     |- Try 144 / 12 = 12. Evaluate 12 == 12, target found!

Now we have found the target, let's trace back the solution:
Final step: 144 / 12 = 12
The step before: 18 - 6 = 12
The first step: 16 * 9 = 144

Output the solution in the required format:
<Solution>
16 * 9 = 144
18 - 6 = 12
144 / 12 = 12
</Solution>

[Problem]
Now, solve the following problem. Note that:
- Please carefully read the approach and examples provided above, and follow them to solve the problem.
- Please ALWAYS include your search procedure (after # Search Procedure). The search procedure should follow the format of the examples provided above.
- Please mark your answer with <Solution> and </Solution> tags. The solution should be a sequence of three equations exactly following the format of the examples above, with no additional text in between.

Numbers: [43, 49, 36, 12]
Target: 42

# Search Procedure
Initial number set: [43, 49, 36, 12], target: 42. Options for choosing two numbers: [(43, 49), (43, 36), (43, 12), (49, 36), (49, 12), (36, 12)].
 |- Pick two numbers (43, 49) (numbers left: [36, 12]). Try possible operations.
  |- Try 49 + 43 = 92. Add 92 to the number set. Current number set: [92, 36, 12], target: 42. Options for choosing two numbers: [(92, 36), (92, 12), (36, 12)].
   |- Pick two numbers (92, 36) (numbers left: [12]). Try possible operations.
    |- Try 92 + 36 = 128. Add 128 to the number set. Current number set: [128, 12], target: 42, just two numbers left.
     |- Try 128 + 12 = 140. Evaluate 140 != 42, drop this branch.
     |- Try 128 - 12 = 116. Evaluate 116 != 42, drop this branch.
     |- Try 128 * 12 = 1536. Evaluate 1536 != 42, drop this branch.
     |- Try 128 / 12 = 10.7. 10.7 is a decimal, drop this branch.
    |- Try 92 - 36 = 56. Add 56 to the number set. Current number set: [56, 12], target: 42, just two numbers left.
     |- Try 56 + 12 = 68. Evaluate 68 != 42, drop this branch.
     |- Try 56 - 12 = 44. Evaluate 44 != 42, drop this branch.
     |- Try 56 * 12 = 672. Evaluate 672 != 42, drop this branch.
     |- Try 56 / 12 = 4.7. 4.7 is a decimal, drop this branch.
    |- Try 92 * 36 = 3312. 3312 exceeds the maximum intermediate result, drop this branch.
    |- Try 92 / 36 = 2.6. 2.6 is a decimal, drop this branch.
   |- Pick two numbers (92, 12) (numbers left: [36]). Try possible operations.
    |- Try 92 + 12 = 104. Add 104 to the number set. Current number set: [104, 36], target: 42, just two numbers left.
     |- Try 104 + 36 = 140. Evaluate 140 != 42, drop this branch.
     |- Try 104 - 36 = 68. Evaluate 68 != 42, drop this branch.
     |- Try 104 * 36 = 3744. 3744 exceeds the maximum intermediate result, drop this branch.
     |- Try 104 / 36 = 2.9. 2.9 is a decimal, drop this branch.
    |- Try 92 - 12 = 80. Add 80 to the number set. Current number set: [80, 36], target: 42, just two numbers left.
     |- Try 80 + 36 = 116. Evaluate 116 != 42, drop this branch.
     |- Try 80 - 36 = 44. Evaluate 44 != 42, drop this branch.
     |- Try 80 * 36 = 2880. 2880 exceeds the maximum intermediate result, drop this branch.
     |- Try 80 / 36 = 2.2. 2.2 is a decimal, drop this branch.
    |- Try 92 * 12 = 1104. Add 1104 to the number set. Current number set: [1104, 36], target: 42, just two numbers left.
     |- Try 1104 + 36 = 1140. Evaluate 1140 != 42, drop this branch.
     |- Try 1104 - 36 = 1068. Evaluate 1068 != 42, drop this branch.
     |- Try 1104 * 36 = 39744. 39744 exceeds the maximum intermediate result, drop this branch.
     |- Try 1104 / 36 = 30.7. 30.7 is a decimal, drop this branch.
    |- Try 92 / 12 = 7.7. 7.7 is a decimal, drop this branch.
   |- Pick two numbers (36, 12) (numbers left: [92]). Try possible operations.
    |- Try 36 + 12 = 48. Add 48 to the number set. Current number set: [48, 92], target: 42, just two numbers left.
     |- Try 92 + 48 = 140. Evaluate 140 != 42, drop this branch.
     |- Try 92 - 48 = 44. Evaluate 44 != 42, drop this branch.
     |- Try 92 * 48 = 4416. 4416 exceeds the maximum intermediate result, drop this branch.
     |- Try 92 / 48 = 1.9. 1.9 is a decimal, drop this branch.
    |- Try 36 - 12 = 24. Add 24 to the number set. Current number set: [24, 92], target: 42, just two numbers left.
     |- Try 92 + 24 = 116. Evaluate 116 != 42, drop this branch.
     |- Try 92 - 24 = 68. Evaluate 68 != 42, drop this branch.
     |- Try 92 * 24 = 2208. 2208 exceeds the maximum intermediate result, drop this branch.
     |- Try 92 / 24 = 3.8. 3.8 is a decimal, drop this branch.
    |- Try 36 * 12 = 432. Add 432 to the number set. Current number set: [432, 92], target: 42, just two numbers left.
     |- Try 432 + 92 = 524. Evaluate 524 != 42, drop this branch.
     |- Try 432 - 92 = 340. Evaluate 340 != 42, drop this branch.
     |- Try 432 * 92 = 39744. 39744 exceeds the maximum intermediate result, drop this branch.
     |- Try 432 / 92 = 4.7. 4.7 is a decimal, drop this branch.
    |- Try 36 / 12 = 3. Add 3 to the number set. Current number set: [3, 92], target: 42, just two numbers left.
     |- Try 92 + 3 = 95. Evaluate 95 != 42, drop this branch.
     |- Try 92 - 3 = 89. Evaluate 89 != 42, drop this branch.
     |- Try 92 * 3 = 276. Evaluate 276 != 42, drop this branch.
     |- Try 92 / 3 = 30.7. 30.7 is a decimal, drop this branch.
  |- Try 49 - 43 = 6. Add 6 to the number set. Current number set: [6, 36, 12], target: 42. Options for choosing two numbers: [(6, 36), (6, 12), (36, 12)].
   |- Pick two numbers (6, 36) (numbers left: [12]). Try possible operations.
    |- Try 36 + 6 = 42. Add 42 to the number set. Current number set: [42, 12], target: 42, just two numbers left.
     |- Try 42 + 12 = 54. Evaluate 54 != 42, drop this branch.
     |- Try 42 - 12 = 30. Evaluate 30 != 42, drop this branch.
     |- Try 42 * 12 = 504. Evaluate 504 != 42, drop this branch.
     |- Try 42 / 12 = 3.5. 3.5 is a decimal, drop this branch.
    |- Try 36 - 6 = 30. Add 30 to the number set. Current number set: [30, 12], target: 42, just two numbers left.
     |- Try 30 + 12 = 42. Evaluate 42 == 42, target found!

Now we have found the target, let's trace back the solution:
Final step: 30 + 12 = 42
The step before: 36 - 6 = 30
The first step: 49 - 43 = 6

Output the solution in the required format:
<Solution>
49 - 43 = 6
36 - 6 = 30
30 + 12 = 42
</Solution>

Solution:
49 - 43 = 6
36 - 6 = 30
30 + 12 = 42


[TASK]
You will be given four numbers and a target number, your task is to find a way to use all four numbers exactly once, along with the basic operations (+, -, *, /), to reach the target number.

[RULES]
- You can use each number exactly once.
- You can use the four basic operations (+, -, *, /).
- The intermediate results must be integers (no decimals allowed).
- The intermediate results must be positive.
- The intermediate results will not exceed 2000.

[APPROACH]
We will solve the problem by searching. Starting from a given set of four numbers, we will follow this search process:
- At each state, we will consider all possible number pairs (in order) from the current number set. Choose one pair and apply one of the four basic operations to them to obtain a new number.
  * If there are still numbers left, we will add the new number to the number set and continue the search.
  * If we have used all numbers, we will check if the new number is equal to the target number. If it is, we have found the solution. Otherwise, we will backtrack.
- Suppose the two numbers we choose are a and b (where a >= b). We will try the four options (a + b), (a - b), (a * b), (a / b) to obtain the new number. Remember to always use the larger number as the first operand.
- If the new number is a decimal, or exceeds the maximum intermediate result, we will discard this branch and backtrack.
- We will continue this process until we reach the target number with four numbers used or exhaust all possible combinations.

[EXAMPLES]
# Example
Numbers: [40, 19, 23, 7]
Target: 29

# Search Procedure
Initial number set: [40, 19, 23, 7], target: 29. Options for choosing two numbers: [(40, 19), (40, 23), (40, 7), (19, 23), (19, 7), (23, 7)].
 |- Pick two numbers (40, 19) (numbers left: [23, 7]). Try possible operations.
  |- Try 40 + 19 = 59. Add 59 to the number set. Current number set: [59, 23, 7], target: 29. Options for choosing two numbers: [(59, 23), (59, 7), (23, 7)].
   |- Pick two numbers (59, 23) (numbers left: [7]). Try possible operations.
    |- Try 59 + 23 = 82. Add 82 to the number set. Current number set: [82, 7], target: 29, just two numbers left.
     |- Try 82 + 7 = 89. Evaluate 89 != 29, drop this branch.
     |- Try 82 - 7 = 75. Evaluate 75 != 29, drop this branch.
     |- Try 82 * 7 = 574. Evaluate 574 != 29, drop this branch.
     |- Try 82 / 7 = 11.7. 11.7 is a decimal, drop this branch.
    |- Try 59 - 23 = 36. Add 36 to the number set. Current number set: [36, 7], target: 29, just two numbers left.
     |- Try 36 + 7 = 43. Evaluate 43 != 29, drop this branch.
     |- Try 36 - 7 = 29. Evaluate 29 == 29, target found!

Now we have found the target, let's trace back the solution:
Final step: 36 - 7 = 29
The step before: 59 - 23 = 36
The first step: 40 + 19 = 59

Output the solution in the required format:
<Solution>
40 + 19 = 59
59 - 23 = 36
36 - 7 = 29
</Solution>

# Example
Numbers: [9, 16, 6, 18]
Target: 12

# Search Procedure
Initial number set: [9, 16, 6, 18], target: 12. Options for choosing two numbers: [(9, 16), (9, 6), (9, 18), (16, 6), (16, 18), (6, 18)].
 |- Pick two numbers (9, 16) (numbers left: [6, 18]). Try possible operations.
  |- Try 16 + 9 = 25. Add 25 to the number set. Current number set: [25, 6, 18], target: 12. Options for choosing two numbers: [(25, 6), (25, 18), (6, 18)].
   |- Pick two numbers (25, 6) (numbers left: [18]). Try possible operations.
    |- Try 25 + 6 = 31. Add 31 to the number set. Current number set: [31, 18], target: 12, just two numbers left.
     |- Try 31 + 18 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 31 - 18 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 31 * 18 = 558. Evaluate 558 != 12, drop this branch.
     |- Try 31 / 18 = 1.7. 1.7 is a decimal, drop this branch.
    |- Try 25 - 6 = 19. Add 19 to the number set. Current number set: [19, 18], target: 12, just two numbers left.
     |- Try 19 + 18 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 19 - 18 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 19 * 18 = 342. Evaluate 342 != 12, drop this branch.
     |- Try 19 / 18 = 1.1. 1.1 is a decimal, drop this branch.
    |- Try 25 * 6 = 150. Add 150 to the number set. Current number set: [150, 18], target: 12, just two numbers left.
     |- Try 150 + 18 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 150 - 18 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 150 * 18 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 150 / 18 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 25 / 6 = 4.2. 4.2 is a decimal, drop this branch.
   |- Pick two numbers (25, 18) (numbers left: [6]). Try possible operations.
    |- Try 25 + 18 = 43. Add 43 to the number set. Current number set: [43, 6], target: 12, just two numbers left.
     |- Try 43 + 6 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 43 - 6 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 43 * 6 = 258. Evaluate 258 != 12, drop this branch.
     |- Try 43 / 6 = 7.2. 7.2 is a decimal, drop this branch.
    |- Try 25 - 18 = 7. Add 7 to the number set. Current number set: [7, 6], target: 12, just two numbers left.
     |- Try 7 + 6 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 7 - 6 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 7 * 6 = 42. Evaluate 42 != 12, drop this branch.
     |- Try 7 / 6 = 1.2. 1.2 is a decimal, drop this branch.
    |- Try 25 * 18 = 450. Add 450 to the number set. Current number set: [450, 6], target: 12, just two numbers left.
     |- Try 450 + 6 = 456. Evaluate 456 != 12, drop this branch.
     |- Try 450 - 6 = 444. Evaluate 444 != 12, drop this branch.
     |- Try 450 * 6 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 450 / 6 = 75. Evaluate 75 != 12, drop this branch.
    |- Try 25 / 18 = 1.4. 1.4 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [25]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 25], target: 12, just two numbers left.
     |- Try 25 + 24 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 25 - 24 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 25 * 24 = 600. Evaluate 600 != 12, drop this branch.
     |- Try 25 / 24 = 1.0. 1.0 is a decimal, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 25], target: 12, just two numbers left.
     |- Try 25 + 12 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 25 - 12 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 25 * 12 = 300. Evaluate 300 != 12, drop this branch.
     |- Try 25 / 12 = 2.1. 2.1 is a decimal, drop this branch.
    |- Try 18 * 6 = 108. Add 108 to the number set. Current number set: [108, 25], target: 12, just two numbers left.
     |- Try 108 + 25 = 133. Evaluate 133 != 12, drop this branch.
     |- Try 108 - 25 = 83. Evaluate 83 != 12, drop this branch.
     |- Try 108 * 25 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 108 / 25 = 4.3. 4.3 is a decimal, drop this branch.
    |- Try 18 / 6 = 3. Add 3 to the number set. Current number set: [3, 25], target: 12, just two numbers left.
     |- Try 25 + 3 = 28. Evaluate 28 != 12, drop this branch.
     |- Try 25 - 3 = 22. Evaluate 22 != 12, drop this branch.
     |- Try 25 * 3 = 75. Evaluate 75 != 12, drop this branch.
     |- Try 25 / 3 = 8.3. 8.3 is a decimal, drop this branch.
  |- Try 16 - 9 = 7. Add 7 to the number set. Current number set: [7, 6, 18], target: 12. Options for choosing two numbers: [(7, 6), (7, 18), (6, 18)].
   |- Pick two numbers (7, 6) (numbers left: [18]). Try possible operations.
    |- Try 7 + 6 = 13. Add 13 to the number set. Current number set: [13, 18], target: 12, just two numbers left.
     |- Try 18 + 13 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 18 - 13 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 18 * 13 = 234. Evaluate 234 != 12, drop this branch.
     |- Try 18 / 13 = 1.4. 1.4 is a decimal, drop this branch.
    |- Try 7 - 6 = 1. Add 1 to the number set. Current number set: [1, 18], target: 12, just two numbers left.
     |- Try 18 + 1 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 18 - 1 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 18 * 1 = 18. Evaluate 18 != 12, drop this branch.
     |- Try 18 / 1 = 18. Evaluate 18 != 12, drop this branch.
    |- Try 7 * 6 = 42. Add 42 to the number set. Current number set: [42, 18], target: 12, just two numbers left.
     |- Try 42 + 18 = 60. Evaluate 60 != 12, drop this branch.
     |- Try 42 - 18 = 24. Evaluate 24 != 12, drop this branch.
     |- Try 42 * 18 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 42 / 18 = 2.3. 2.3 is a decimal, drop this branch.
    |- Try 7 / 6 = 1.2. 1.2 is a decimal, drop this branch.
   |- Pick two numbers (7, 18) (numbers left: [6]). Try possible operations.
    |- Try 18 + 7 = 25. Add 25 to the number set. Current number set: [25, 6], target: 12, just two numbers left.
     |- Try 25 + 6 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 25 - 6 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 25 * 6 = 150. Evaluate 150 != 12, drop this branch.
     |- Try 25 / 6 = 4.2. 4.2 is a decimal, drop this branch.
    |- Try 18 - 7 = 11. Add 11 to the number set. Current number set: [11, 6], target: 12, just two numbers left.
     |- Try 11 + 6 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 11 - 6 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 11 * 6 = 66. Evaluate 66 != 12, drop this branch.
     |- Try 11 / 6 = 1.8. 1.8 is a decimal, drop this branch.
    |- Try 18 * 7 = 126. Add 126 to the number set. Current number set: [126, 6], target: 12, just two numbers left.
     |- Try 126 + 6 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 126 - 6 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 126 * 6 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 126 / 6 = 21. Evaluate 21 != 12, drop this branch.
    |- Try 18 / 7 = 2.6. 2.6 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [7]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 7], target: 12, just two numbers left.
     |- Try 24 + 7 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 24 - 7 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 24 * 7 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 24 / 7 = 3.4. 3.4 is a decimal, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 7], target: 12, just two numbers left.
     |- Try 12 + 7 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 12 - 7 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 12 * 7 = 84. Evaluate 84 != 12, drop this branch.
     |- Try 12 / 7 = 1.7. 1.7 is a decimal, drop this branch.
    |- Try 18 * 6 = 108. Add 108 to the number set. Current number set: [108, 7], target: 12, just two numbers left.
     |- Try 108 + 7 = 115. Evaluate 115 != 12, drop this branch.
     |- Try 108 - 7 = 101. Evaluate 101 != 12, drop this branch.
     |- Try 108 * 7 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 108 / 7 = 15.4. 15.4 is a decimal, drop this branch.
    |- Try 18 / 6 = 3. Add 3 to the number set. Current number set: [3, 7], target: 12, just two numbers left.
     |- Try 7 + 3 = 10. Evaluate 10 != 12, drop this branch.
     |- Try 7 - 3 = 4. Evaluate 4 != 12, drop this branch.
     |- Try 7 * 3 = 21. Evaluate 21 != 12, drop this branch.
     |- Try 7 / 3 = 2.3. 2.3 is a decimal, drop this branch.
  |- Try 16 * 9 = 144. Add 144 to the number set. Current number set: [144, 6, 18], target: 12. Options for choosing two numbers: [(144, 6), (144, 18), (6, 18)].
   |- Pick two numbers (144, 6) (numbers left: [18]). Try possible operations.
    |- Try 144 + 6 = 150. Add 150 to the number set. Current number set: [150, 18], target: 12, just two numbers left.
     |- Try 150 + 18 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 150 - 18 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 150 * 18 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 150 / 18 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 144 - 6 = 138. Add 138 to the number set. Current number set: [138, 18], target: 12, just two numbers left.
     |- Try 138 + 18 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 138 - 18 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 138 * 18 = 2484. 2484 exceeds the maximum intermediate result, drop this branch.
     |- Try 138 / 18 = 7.7. 7.7 is a decimal, drop this branch.
    |- Try 144 * 6 = 864. Add 864 to the number set. Current number set: [864, 18], target: 12, just two numbers left.
     |- Try 864 + 18 = 882. Evaluate 882 != 12, drop this branch.
     |- Try 864 - 18 = 846. Evaluate 846 != 12, drop this branch.
     |- Try 864 * 18 = 15552. 15552 exceeds the maximum intermediate result, drop this branch.
     |- Try 864 / 18 = 48. Evaluate 48 != 12, drop this branch.
    |- Try 144 / 6 = 24. Add 24 to the number set. Current number set: [24, 18], target: 12, just two numbers left.
     |- Try 24 + 18 = 42. Evaluate 42 != 12, drop this branch.
     |- Try 24 - 18 = 6. Evaluate 6 != 12, drop this branch.
     |- Try 24 * 18 = 432. Evaluate 432 != 12, drop this branch.
     |- Try 24 / 18 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (144, 18) (numbers left: [6]). Try possible operations.
    |- Try 144 + 18 = 162. Add 162 to the number set. Current number set: [162, 6], target: 12, just two numbers left.
     |- Try 162 + 6 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 162 - 6 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 162 * 6 = 972. Evaluate 972 != 12, drop this branch.
     |- Try 162 / 6 = 27. Evaluate 27 != 12, drop this branch.
    |- Try 144 - 18 = 126. Add 126 to the number set. Current number set: [126, 6], target: 12, just two numbers left.
     |- Try 126 + 6 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 126 - 6 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 126 * 6 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 126 / 6 = 21. Evaluate 21 != 12, drop this branch.
    |- Try 144 * 18 = 2592. 2592 exceeds the maximum intermediate result, drop this branch.
    |- Try 144 / 18 = 8. Add 8 to the number set. Current number set: [8, 6], target: 12, just two numbers left.
     |- Try 8 + 6 = 14. Evaluate 14 != 12, drop this branch.
     |- Try 8 - 6 = 2. Evaluate 2 != 12, drop this branch.
     |- Try 8 * 6 = 48. Evaluate 48 != 12, drop this branch.
     |- Try 8 / 6 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [144]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 144], target: 12, just two numbers left.
     |- Try 144 + 24 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 144 - 24 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 144 * 24 = 3456. 3456 exceeds the maximum intermediate result, drop this branch.
     |- Try 144 / 24 = 6. Evaluate 6 != 12, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 144], target: 12, just two numbers left.
     |- Try 144 + 12 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 144 - 12 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 144 * 12 = 1728. Evaluate 1728 != 12, drop this branch.
     |- Try 144 / 12 = 12. Evaluate 12 == 12, target found!

Now we have found the target, let's trace back the solution:
Final step: 144 / 12 = 12
The step before: 18 - 6 = 12
The first step: 16 * 9 = 144

Output the solution in the required format:
<Solution>
16 * 9 = 144
18 - 6 = 12
144 / 12 = 12
</Solution>

[Problem]
Now, solve the following problem. Note that:
- Please carefully read the approach and examples provided above, and follow them to solve the problem.
- Please ALWAYS include your search procedure (after # Search Procedure). The search procedure should follow the format of the examples provided above.
- Please mark your answer with <Solution> and </Solution> tags. The solution should be a sequence of three equations exactly following the format of the examples above, with no additional text in between.

Numbers: [14, 27, 18, 19]
Target: 50

# Search Procedure
Initial number set: [14, 27, 18, 19], target: 50. Options for choosing two numbers: [(14, 27), (14, 18), (14, 19), (27, 18), (27, 19), (18, 19)].
 |- Pick two numbers (14, 27) (numbers left: [18, 19]). Try possible operations.
  |- Try 27 + 14 = 41. Add 41 to the number set. Current number set: [41, 18, 19], target: 50. Options for choosing two numbers: [(41, 18), (41, 19), (18, 19)].
   |- Pick two numbers (41, 18) (numbers left: [19]). Try possible operations.
    |- Try 41 + 18 = 59. Add 59 to the number set. Current number set: [59, 19], target: 50, just two numbers left.
     |- Try 59 + 19 = 78. Evaluate 78 != 50, drop this branch.
     |- Try 59 - 19 = 40. Evaluate 40 != 50, drop this branch.
     |- Try 59 * 19 = 1121. Evaluate 1121 != 50, drop this branch.
     |- Try 59 / 19 = 3.1. 3.1 is a decimal, drop this branch.
    |- Try 41 - 18 = 23. Add 23 to the number set. Current number set: [23, 19], target: 50, just two numbers left.
     |- Try 23 + 19 = 42. Evaluate 42 != 50, drop this branch.
     |- Try 23 - 19 = 4. Evaluate 4 != 50, drop this branch.
     |- Try 23 * 19 = 437. Evaluate 437 != 50, drop this branch.
     |- Try 23 / 19 = 1.2. 1.2 is a decimal, drop this branch.
    |- Try 41 * 18 = 738. Add 738 to the number set. Current number set: [738, 19], target: 50, just two numbers left.
     |- Try 738 + 19 = 757. Evaluate 757 != 50, drop this branch.
     |- Try 738 - 19 = 719. Evaluate 719 != 50, drop this branch.
     |- Try 738 * 19 = 14022. 14022 exceeds the maximum intermediate result, drop this branch.
     |- Try 738 / 19 = 38.8. 38.8 is a decimal, drop this branch.
    |- Try 41 / 18 = 2.3. 2.3 is a decimal, drop this branch.
   |- Pick two numbers (41, 19) (numbers left: [18]). Try possible operations.
    |- Try 41 + 19 = 60. Add 60 to the number set. Current number set: [60, 18], target: 50, just two numbers left.
     |- Try 60 + 18 = 78. Evaluate 78 != 50, drop this branch.
     |- Try 60 - 18 = 42. Evaluate 42 != 50, drop this branch.
     |- Try 60 * 18 = 1080. Evaluate 1080 != 50, drop this branch.
     |- Try 60 / 18 = 3.3. 3.3 is a decimal, drop this branch.
    |- Try 41 - 19 = 22. Add 22 to the number set. Current number set: [22, 18], target: 50, just two numbers left.
     |- Try 22 + 18 = 40. Evaluate 40 != 50, drop this branch.
     |- Try 22 - 18 = 4. Evaluate 4 != 50, drop this branch.
     |- Try 22 * 18 = 396. Evaluate 396 != 50, drop this branch.
     |- Try 22 / 18 = 1.2. 1.2 is a decimal, drop this branch.
    |- Try 41 * 19 = 779. Add 779 to the number set. Current number set: [779, 18], target: 50, just two numbers left.
     |- Try 779 + 18 = 797. Evaluate 797 != 50, drop this branch.
     |- Try 779 - 18 = 761. Evaluate 761 != 50, drop this branch.
     |- Try 779 * 18 = 14022. 14022 exceeds the maximum intermediate result, drop this branch.
     |- Try 779 / 18 = 43.3. 43.3 is a decimal, drop this branch.
    |- Try 41 / 19 = 2.2. 2.2 is a decimal, drop this branch.
   |- Pick two numbers (18, 19) (numbers left: [41]). Try possible operations.
    |- Try 19 + 18 = 37. Add 37 to the number set. Current number set: [37, 41], target: 50, just two numbers left.
     |- Try 41 + 37 = 78. Evaluate 78 != 50, drop this branch.
     |- Try 41 - 37 = 4. Evaluate 4 != 50, drop this branch.
     |- Try 41 * 37 = 1517. Evaluate 1517 != 50, drop this branch.
     |- Try 41 / 37 = 1.1. 1.1 is a decimal, drop this branch.
    |- Try 19 - 18 = 1. Add 1 to the number set. Current number set: [1, 41], target: 50, just two numbers left.
     |- Try 41 + 1 = 42. Evaluate 42 != 50, drop this branch.
     |- Try 41 - 1 = 40. Evaluate 40 != 50, drop this branch.
     |- Try 41 * 1 = 41. Evaluate 41 != 50, drop this branch.
     |- Try 41 / 1 = 41. Evaluate 41 != 50, drop this branch.
    |- Try 19 * 18 = 342. Add 342 to the number set. Current number set: [342, 41], target: 50, just two numbers left.
     |- Try 342 + 41 = 383. Evaluate 383 != 50, drop this branch.
     |- Try 342 - 41 = 301. Evaluate 301 != 50, drop this branch.
     |- Try 342 * 41 = 14022. 14022 exceeds the maximum intermediate result, drop this branch.
     |- Try 342 / 41 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 19 / 18 = 1.1. 1.1 is a decimal, drop this branch.
  |- Try 27 - 14 = 13. Add 13 to the number set. Current number set: [13, 18, 19], target: 50. Options for choosing two numbers: [(13, 18), (13, 19), (18, 19)].
   |- Pick two numbers (13, 18) (numbers left: [19]). Try possible operations.
    |- Try 18 + 13 = 31. Add 31 to the number set. Current number set: [31, 19], target: 50, just two numbers left.
     |- Try 31 + 19 = 50. Evaluate 50 == 50, target found!

Now we have found the target, let's trace back the solution:
Final step: 31 + 19 = 50
The step before: 18 + 13 = 31
The first step: 27 - 14 = 13

Output the solution in the required format:
<Solution>
27 - 14 = 13
18 + 13 = 31
31 + 19 = 50
</Solution>

Solution:
27 - 14 = 13
18 + 13 = 31
31 + 19 = 50


[TASK]
You will be given four numbers and a target number, your task is to find a way to use all four numbers exactly once, along with the basic operations (+, -, *, /), to reach the target number.

[RULES]
- You can use each number exactly once.
- You can use the four basic operations (+, -, *, /).
- The intermediate results must be integers (no decimals allowed).
- The intermediate results must be positive.
- The intermediate results will not exceed 2000.

[APPROACH]
We will solve the problem by searching. Starting from a given set of four numbers, we will follow this search process:
- At each state, we will consider all possible number pairs (in order) from the current number set. Choose one pair and apply one of the four basic operations to them to obtain a new number.
  * If there are still numbers left, we will add the new number to the number set and continue the search.
  * If we have used all numbers, we will check if the new number is equal to the target number. If it is, we have found the solution. Otherwise, we will backtrack.
- Suppose the two numbers we choose are a and b (where a >= b). We will try the four options (a + b), (a - b), (a * b), (a / b) to obtain the new number. Remember to always use the larger number as the first operand.
- If the new number is a decimal, or exceeds the maximum intermediate result, we will discard this branch and backtrack.
- We will continue this process until we reach the target number with four numbers used or exhaust all possible combinations.

[EXAMPLES]
# Example
Numbers: [40, 19, 23, 7]
Target: 29

# Search Procedure
Initial number set: [40, 19, 23, 7], target: 29. Options for choosing two numbers: [(40, 19), (40, 23), (40, 7), (19, 23), (19, 7), (23, 7)].
 |- Pick two numbers (40, 19) (numbers left: [23, 7]). Try possible operations.
  |- Try 40 + 19 = 59. Add 59 to the number set. Current number set: [59, 23, 7], target: 29. Options for choosing two numbers: [(59, 23), (59, 7), (23, 7)].
   |- Pick two numbers (59, 23) (numbers left: [7]). Try possible operations.
    |- Try 59 + 23 = 82. Add 82 to the number set. Current number set: [82, 7], target: 29, just two numbers left.
     |- Try 82 + 7 = 89. Evaluate 89 != 29, drop this branch.
     |- Try 82 - 7 = 75. Evaluate 75 != 29, drop this branch.
     |- Try 82 * 7 = 574. Evaluate 574 != 29, drop this branch.
     |- Try 82 / 7 = 11.7. 11.7 is a decimal, drop this branch.
    |- Try 59 - 23 = 36. Add 36 to the number set. Current number set: [36, 7], target: 29, just two numbers left.
     |- Try 36 + 7 = 43. Evaluate 43 != 29, drop this branch.
     |- Try 36 - 7 = 29. Evaluate 29 == 29, target found!

Now we have found the target, let's trace back the solution:
Final step: 36 - 7 = 29
The step before: 59 - 23 = 36
The first step: 40 + 19 = 59

Output the solution in the required format:
<Solution>
40 + 19 = 59
59 - 23 = 36
36 - 7 = 29
</Solution>

# Example
Numbers: [9, 16, 6, 18]
Target: 12

# Search Procedure
Initial number set: [9, 16, 6, 18], target: 12. Options for choosing two numbers: [(9, 16), (9, 6), (9, 18), (16, 6), (16, 18), (6, 18)].
 |- Pick two numbers (9, 16) (numbers left: [6, 18]). Try possible operations.
  |- Try 16 + 9 = 25. Add 25 to the number set. Current number set: [25, 6, 18], target: 12. Options for choosing two numbers: [(25, 6), (25, 18), (6, 18)].
   |- Pick two numbers (25, 6) (numbers left: [18]). Try possible operations.
    |- Try 25 + 6 = 31. Add 31 to the number set. Current number set: [31, 18], target: 12, just two numbers left.
     |- Try 31 + 18 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 31 - 18 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 31 * 18 = 558. Evaluate 558 != 12, drop this branch.
     |- Try 31 / 18 = 1.7. 1.7 is a decimal, drop this branch.
    |- Try 25 - 6 = 19. Add 19 to the number set. Current number set: [19, 18], target: 12, just two numbers left.
     |- Try 19 + 18 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 19 - 18 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 19 * 18 = 342. Evaluate 342 != 12, drop this branch.
     |- Try 19 / 18 = 1.1. 1.1 is a decimal, drop this branch.
    |- Try 25 * 6 = 150. Add 150 to the number set. Current number set: [150, 18], target: 12, just two numbers left.
     |- Try 150 + 18 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 150 - 18 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 150 * 18 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 150 / 18 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 25 / 6 = 4.2. 4.2 is a decimal, drop this branch.
   |- Pick two numbers (25, 18) (numbers left: [6]). Try possible operations.
    |- Try 25 + 18 = 43. Add 43 to the number set. Current number set: [43, 6], target: 12, just two numbers left.
     |- Try 43 + 6 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 43 - 6 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 43 * 6 = 258. Evaluate 258 != 12, drop this branch.
     |- Try 43 / 6 = 7.2. 7.2 is a decimal, drop this branch.
    |- Try 25 - 18 = 7. Add 7 to the number set. Current number set: [7, 6], target: 12, just two numbers left.
     |- Try 7 + 6 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 7 - 6 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 7 * 6 = 42. Evaluate 42 != 12, drop this branch.
     |- Try 7 / 6 = 1.2. 1.2 is a decimal, drop this branch.
    |- Try 25 * 18 = 450. Add 450 to the number set. Current number set: [450, 6], target: 12, just two numbers left.
     |- Try 450 + 6 = 456. Evaluate 456 != 12, drop this branch.
     |- Try 450 - 6 = 444. Evaluate 444 != 12, drop this branch.
     |- Try 450 * 6 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 450 / 6 = 75. Evaluate 75 != 12, drop this branch.
    |- Try 25 / 18 = 1.4. 1.4 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [25]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 25], target: 12, just two numbers left.
     |- Try 25 + 24 = 49. Evaluate 49 != 12, drop this branch.
     |- Try 25 - 24 = 1. Evaluate 1 != 12, drop this branch.
     |- Try 25 * 24 = 600. Evaluate 600 != 12, drop this branch.
     |- Try 25 / 24 = 1.0. 1.0 is a decimal, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 25], target: 12, just two numbers left.
     |- Try 25 + 12 = 37. Evaluate 37 != 12, drop this branch.
     |- Try 25 - 12 = 13. Evaluate 13 != 12, drop this branch.
     |- Try 25 * 12 = 300. Evaluate 300 != 12, drop this branch.
     |- Try 25 / 12 = 2.1. 2.1 is a decimal, drop this branch.
    |- Try 18 * 6 = 108. Add 108 to the number set. Current number set: [108, 25], target: 12, just two numbers left.
     |- Try 108 + 25 = 133. Evaluate 133 != 12, drop this branch.
     |- Try 108 - 25 = 83. Evaluate 83 != 12, drop this branch.
     |- Try 108 * 25 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 108 / 25 = 4.3. 4.3 is a decimal, drop this branch.
    |- Try 18 / 6 = 3. Add 3 to the number set. Current number set: [3, 25], target: 12, just two numbers left.
     |- Try 25 + 3 = 28. Evaluate 28 != 12, drop this branch.
     |- Try 25 - 3 = 22. Evaluate 22 != 12, drop this branch.
     |- Try 25 * 3 = 75. Evaluate 75 != 12, drop this branch.
     |- Try 25 / 3 = 8.3. 8.3 is a decimal, drop this branch.
  |- Try 16 - 9 = 7. Add 7 to the number set. Current number set: [7, 6, 18], target: 12. Options for choosing two numbers: [(7, 6), (7, 18), (6, 18)].
   |- Pick two numbers (7, 6) (numbers left: [18]). Try possible operations.
    |- Try 7 + 6 = 13. Add 13 to the number set. Current number set: [13, 18], target: 12, just two numbers left.
     |- Try 18 + 13 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 18 - 13 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 18 * 13 = 234. Evaluate 234 != 12, drop this branch.
     |- Try 18 / 13 = 1.4. 1.4 is a decimal, drop this branch.
    |- Try 7 - 6 = 1. Add 1 to the number set. Current number set: [1, 18], target: 12, just two numbers left.
     |- Try 18 + 1 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 18 - 1 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 18 * 1 = 18. Evaluate 18 != 12, drop this branch.
     |- Try 18 / 1 = 18. Evaluate 18 != 12, drop this branch.
    |- Try 7 * 6 = 42. Add 42 to the number set. Current number set: [42, 18], target: 12, just two numbers left.
     |- Try 42 + 18 = 60. Evaluate 60 != 12, drop this branch.
     |- Try 42 - 18 = 24. Evaluate 24 != 12, drop this branch.
     |- Try 42 * 18 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 42 / 18 = 2.3. 2.3 is a decimal, drop this branch.
    |- Try 7 / 6 = 1.2. 1.2 is a decimal, drop this branch.
   |- Pick two numbers (7, 18) (numbers left: [6]). Try possible operations.
    |- Try 18 + 7 = 25. Add 25 to the number set. Current number set: [25, 6], target: 12, just two numbers left.
     |- Try 25 + 6 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 25 - 6 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 25 * 6 = 150. Evaluate 150 != 12, drop this branch.
     |- Try 25 / 6 = 4.2. 4.2 is a decimal, drop this branch.
    |- Try 18 - 7 = 11. Add 11 to the number set. Current number set: [11, 6], target: 12, just two numbers left.
     |- Try 11 + 6 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 11 - 6 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 11 * 6 = 66. Evaluate 66 != 12, drop this branch.
     |- Try 11 / 6 = 1.8. 1.8 is a decimal, drop this branch.
    |- Try 18 * 7 = 126. Add 126 to the number set. Current number set: [126, 6], target: 12, just two numbers left.
     |- Try 126 + 6 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 126 - 6 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 126 * 6 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 126 / 6 = 21. Evaluate 21 != 12, drop this branch.
    |- Try 18 / 7 = 2.6. 2.6 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [7]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 7], target: 12, just two numbers left.
     |- Try 24 + 7 = 31. Evaluate 31 != 12, drop this branch.
     |- Try 24 - 7 = 17. Evaluate 17 != 12, drop this branch.
     |- Try 24 * 7 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 24 / 7 = 3.4. 3.4 is a decimal, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 7], target: 12, just two numbers left.
     |- Try 12 + 7 = 19. Evaluate 19 != 12, drop this branch.
     |- Try 12 - 7 = 5. Evaluate 5 != 12, drop this branch.
     |- Try 12 * 7 = 84. Evaluate 84 != 12, drop this branch.
     |- Try 12 / 7 = 1.7. 1.7 is a decimal, drop this branch.
    |- Try 18 * 6 = 108. Add 108 to the number set. Current number set: [108, 7], target: 12, just two numbers left.
     |- Try 108 + 7 = 115. Evaluate 115 != 12, drop this branch.
     |- Try 108 - 7 = 101. Evaluate 101 != 12, drop this branch.
     |- Try 108 * 7 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 108 / 7 = 15.4. 15.4 is a decimal, drop this branch.
    |- Try 18 / 6 = 3. Add 3 to the number set. Current number set: [3, 7], target: 12, just two numbers left.
     |- Try 7 + 3 = 10. Evaluate 10 != 12, drop this branch.
     |- Try 7 - 3 = 4. Evaluate 4 != 12, drop this branch.
     |- Try 7 * 3 = 21. Evaluate 21 != 12, drop this branch.
     |- Try 7 / 3 = 2.3. 2.3 is a decimal, drop this branch.
  |- Try 16 * 9 = 144. Add 144 to the number set. Current number set: [144, 6, 18], target: 12. Options for choosing two numbers: [(144, 6), (144, 18), (6, 18)].
   |- Pick two numbers (144, 6) (numbers left: [18]). Try possible operations.
    |- Try 144 + 6 = 150. Add 150 to the number set. Current number set: [150, 18], target: 12, just two numbers left.
     |- Try 150 + 18 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 150 - 18 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 150 * 18 = 2700. 2700 exceeds the maximum intermediate result, drop this branch.
     |- Try 150 / 18 = 8.3. 8.3 is a decimal, drop this branch.
    |- Try 144 - 6 = 138. Add 138 to the number set. Current number set: [138, 18], target: 12, just two numbers left.
     |- Try 138 + 18 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 138 - 18 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 138 * 18 = 2484. 2484 exceeds the maximum intermediate result, drop this branch.
     |- Try 138 / 18 = 7.7. 7.7 is a decimal, drop this branch.
    |- Try 144 * 6 = 864. Add 864 to the number set. Current number set: [864, 18], target: 12, just two numbers left.
     |- Try 864 + 18 = 882. Evaluate 882 != 12, drop this branch.
     |- Try 864 - 18 = 846. Evaluate 846 != 12, drop this branch.
     |- Try 864 * 18 = 15552. 15552 exceeds the maximum intermediate result, drop this branch.
     |- Try 864 / 18 = 48. Evaluate 48 != 12, drop this branch.
    |- Try 144 / 6 = 24. Add 24 to the number set. Current number set: [24, 18], target: 12, just two numbers left.
     |- Try 24 + 18 = 42. Evaluate 42 != 12, drop this branch.
     |- Try 24 - 18 = 6. Evaluate 6 != 12, drop this branch.
     |- Try 24 * 18 = 432. Evaluate 432 != 12, drop this branch.
     |- Try 24 / 18 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (144, 18) (numbers left: [6]). Try possible operations.
    |- Try 144 + 18 = 162. Add 162 to the number set. Current number set: [162, 6], target: 12, just two numbers left.
     |- Try 162 + 6 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 162 - 6 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 162 * 6 = 972. Evaluate 972 != 12, drop this branch.
     |- Try 162 / 6 = 27. Evaluate 27 != 12, drop this branch.
    |- Try 144 - 18 = 126. Add 126 to the number set. Current number set: [126, 6], target: 12, just two numbers left.
     |- Try 126 + 6 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 126 - 6 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 126 * 6 = 756. Evaluate 756 != 12, drop this branch.
     |- Try 126 / 6 = 21. Evaluate 21 != 12, drop this branch.
    |- Try 144 * 18 = 2592. 2592 exceeds the maximum intermediate result, drop this branch.
    |- Try 144 / 18 = 8. Add 8 to the number set. Current number set: [8, 6], target: 12, just two numbers left.
     |- Try 8 + 6 = 14. Evaluate 14 != 12, drop this branch.
     |- Try 8 - 6 = 2. Evaluate 2 != 12, drop this branch.
     |- Try 8 * 6 = 48. Evaluate 48 != 12, drop this branch.
     |- Try 8 / 6 = 1.3. 1.3 is a decimal, drop this branch.
   |- Pick two numbers (6, 18) (numbers left: [144]). Try possible operations.
    |- Try 18 + 6 = 24. Add 24 to the number set. Current number set: [24, 144], target: 12, just two numbers left.
     |- Try 144 + 24 = 168. Evaluate 168 != 12, drop this branch.
     |- Try 144 - 24 = 120. Evaluate 120 != 12, drop this branch.
     |- Try 144 * 24 = 3456. 3456 exceeds the maximum intermediate result, drop this branch.
     |- Try 144 / 24 = 6. Evaluate 6 != 12, drop this branch.
    |- Try 18 - 6 = 12. Add 12 to the number set. Current number set: [12, 144], target: 12, just two numbers left.
     |- Try 144 + 12 = 156. Evaluate 156 != 12, drop this branch.
     |- Try 144 - 12 = 132. Evaluate 132 != 12, drop this branch.
     |- Try 144 * 12 = 1728. Evaluate 1728 != 12, drop this branch.
     |- Try 144 / 12 = 12. Evaluate 12 == 12, target found!

Now we have found the target, let's trace back the solution:
Final step: 144 / 12 = 12
The step before: 18 - 6 = 12
The first step: 16 * 9 = 144

Output the solution in the required format:
<Solution>
16 * 9 = 144
18 - 6 = 12
144 / 12 = 12
</Solution>

[Problem]
Now, solve the following problem. Note that:
- Please carefully read the approach and examples provided above, and follow them to solve the problem.
- Please ALWAYS include your search procedure (after # Search Procedure). The search procedure should follow the format of the examples provided above.
- Please mark your answer with <Solution> and </Solution> tags. The solution should be a sequence of three equations exactly following the format of the examples above, with no additional text in between.

Numbers: [26, 16, 8, 10]
Target: 20

# Search Procedure
Initial number set: [26, 16, 8, 10], target: 20. Options for choosing two numbers: [(26, 16), (26, 8), (26, 10), (16, 8), (16, 10), (8, 10)].
 |- Pick two numbers (26, 16) (numbers left: [8, 10]). Try possible operations.
  |- Try 26 + 16 = 42. Add 42 to the number set. Current number set: [42, 8, 10], target: 20. Options for choosing two numbers: [(42, 8), (42, 10), (8, 10)].
   |- Pick two numbers (42, 8) (numbers left: [10]). Try possible operations.
    |- Try 42 + 8 = 50. Add 50 to the number set. Current number set: [50, 10], target: 20, just two numbers left.
     |- Try 50 + 10 = 60. Evaluate 60 != 20, drop this branch.
     |- Try 50 - 10 = 40. Evaluate 40 != 20, drop this branch.
     |- Try 50 * 10 = 500. Evaluate 500 != 20, drop this branch.
     |- Try 50 / 10 = 5. Evaluate 5 != 20, drop this branch.
    |- Try 42 - 8 = 34. Add 34 to the number set. Current number set: [34, 10], target: 20, just two numbers left.
     |- Try 34 + 10 = 44. Evaluate 44 != 20, drop this branch.
     |- Try 34 - 10 = 24. Evaluate 24 != 20, drop this branch.
     |- Try 34 * 10 = 340. Evaluate 340 != 20, drop this branch.
     |- Try 34 / 10 = 3.4. 3.4 is a decimal, drop this branch.
    |- Try 42 * 8 = 336. Add 336 to the number set. Current number set: [336, 10], target: 20, just two numbers left.
     |- Try 336 + 10 = 346. Evaluate 346 != 20, drop this branch.
     |- Try 336 - 10 = 326. Evaluate 326 != 20, drop this branch.
     |- Try 336 * 10 = 3360. 3360 exceeds the maximum intermediate result, drop this branch.
     |- Try 336 / 10 = 33.6. 33.6 is a decimal, drop this branch.
    |- Try 42 / 8 = 5.2. 5.2 is a decimal, drop this branch.
   |- Pick two numbers (42, 10) (numbers left: [8]). Try possible operations.
    |- Try 42 + 10 = 52. Add 52 to the number set. Current number set: [52, 8], target: 20, just two numbers left.
     |- Try 52 + 8 = 60. Evaluate 60 != 20, drop this branch.
     |- Try 52 - 8 = 44. Evaluate 44 != 20, drop this branch.
     |- Try 52 * 8 = 416. Evaluate 416 != 20, drop this branch.
     |- Try 52 / 8 = 6.5. 6.5 is a decimal, drop this branch.
    |- Try 42 - 10 = 32. Add 32 to the number set. Current number set: [32, 8], target: 20, just two numbers left.
     |- Try 32 + 8 = 40. Evaluate 40 != 20, drop this branch.
     |- Try 32 - 8 = 24. Evaluate 24 != 20, drop this branch.
     |- Try 32 * 8 = 256. Evaluate 256 != 20, drop this branch.
     |- Try 32 / 8 = 4. Evaluate 4 != 20, drop this branch.
    |- Try 42 * 10 = 420. Add 420 to the number set. Current number set: [420, 8], target: 20, just two numbers left.
     |- Try 420 + 8 = 428. Evaluate 428 != 20, drop this branch.
     |- Try 420 - 8 = 412. Evaluate 412 != 20, drop this branch.
     |- Try 420 * 8 = 3360. 3360 exceeds the maximum intermediate result, drop this branch.
     |- Try 420 / 8 = 52.5. 52.5 is a decimal, drop this branch.
    |- Try 42 / 10 = 4.2. 4.2 is a decimal, drop this branch.
   |- Pick two numbers (8, 10) (numbers left: [42]). Try possible operations.
    |- Try 10 + 8 = 18. Add 18 to the number set. Current number set: [18, 42], target: 20, just two numbers left.
     |- Try 42 + 18 = 60. Evaluate 60 != 20, drop this branch.
     |- Try 42 - 18 = 24. Evaluate 24 != 20, drop this branch.
     |- Try 42 * 18 = 756. Evaluate 756 != 20, drop this branch.
     |- Try 42 / 18 = 2.3. 2.3 is a decimal, drop this branch.
    |- Try 10 - 8 = 2. Add 2 to the number set. Current number set: [2, 42], target: 20, just two numbers left.
     |- Try 42 + 2 = 44. Evaluate 44 != 20, drop this branch.
     |- Try 42 - 2 = 40. Evaluate 40 != 20, drop this branch.
     |- Try 42 * 2 = 84. Evaluate 84 != 20, drop this branch.
     |- Try 42 / 2 = 21. Evaluate 21 != 20, drop this branch.
    |- Try 10 * 8 = 80. Add 80 to the number set. Current number set: [80, 42], target: 20, just two numbers left.
     |- Try 80 + 42 = 122. Evaluate 122 != 20, drop this branch.
     |- Try 80 - 42 = 38. Evaluate 38 != 20, drop this branch.
     |- Try 80 * 42 = 3360. 3360 exceeds the maximum intermediate result, drop this branch.
     |- Try 80 / 42 = 1.9. 1.9 is a decimal, drop this branch.
    |- Try 10 / 8 = 1.2. 1.2 is a decimal, drop this branch.
  |- Try 26 - 16 = 10. Add 10 to the number set. Current number set: [10, 8, 10], target: 20. Options for choosing two numbers: [(10, 8), (10, 10), (8, 10)].
   |- Pick two numbers (10, 8) (numbers left: [10]). Try possible operations.
    |- Try 10 + 8 = 18. Add 18 to the number set. Current number set: [18, 10], target: 20, just two numbers left.
     |- Try 18 + 10 = 28. Evaluate 28 != 20, drop this branch.
     |- Try 18 - 10 = 8. Evaluate 8 != 20, drop this branch.
     |- Try 18 * 10 = 180. Evaluate 180 != 20, drop this branch.
     |- Try 18 / 10 = 1.8. 1.8 is a decimal, drop this branch.
    |- Try 10 - 8 = 2. Add 2 to the number set. Current number set: [2, 10], target: 20, just two numbers left.
     |- Try 10 + 2 = 12. Evaluate 12 != 20, drop this branch.
     |- Try 10 - 2 = 8. Evaluate 8 != 20, drop this branch.
     |- Try 10 * 2 = 20. Evaluate 20 == 20, target found!

Now we have found the target, let's trace back the solution:
Final step: 10 * 2 = 20
The step before: 10 - 8 = 2
The first step: 26 - 16 = 10

Output the solution in the required format:
<Solution>
26 - 16 = 10
10 - 8 = 2
10 * 2 = 20
</Solution>

Solution:
26 - 16 = 10
10 - 8 = 2
10 * 2 = 20