10 Again, I [P] is the indicator function that returns 1 if P evaluates to true and 0 otherwise.
we include the two target phrases, their aligned source phrases, the direction of the target attachment, the orientation between the source and target phrases (whether the two target phrases are in the same order as their aligned source phrases or swapped), whether a gap is present between the two target phrases, and finally whether a gap is present between the two source phrases.