因明入正理論疏 2.34

2.34

彼復又言：「若有於此一分已成，隨說一分亦成能立。」謂於二喻，有已解同，應但說異；有已解異，應但說同。不具說二，亦成能立。

He further stated: "If for someone one part is already established, stating whichever one part also constitutes a proof." This means that regarding the two examples, for someone who already understands similarity, one should only state dissimilarity; for someone who already understands dissimilarity, one should only state similarity. Even without stating both fully, it also constitutes a proof.