Because there are re-orderings in the translation, the positions of these words are perhaps not continuous.
the translation hypotheses should meet the following requirements: a) the positions of the source words covered by p 2 are fully contained in the span of the subtree; or b) the positions of the source words covered by p 2 are continuous and are located at the tail of the source words covered by the subtree, and the source words covered by p 1 fully cover the remained positions of the subtree.