We then set the two cells to zero, and obtain an updated matrix as follows, b c a d a 0 0 1 0 b 0 0 0 0 c 0 0 0 0 d 0 0 0 1 In Table 2, we found that cell(0,2) and cell(3,3) have values greater than zero.
a and b will be extracted the common terms.