atha mataṃ yo vivakṣāviparivartī rūpādir artho yaś ca bāhyas tayoḥ sārūpyamastyataḥ sārūpyādacodite bāhye pravṛttir bhaviṣyati yamalakavad ityata āha sārūpyād iti /
Now if it is thought that "there exists similarity between the object like form etc. that accompanies the desire to speak and the external [object], therefore application to the unexpressed external [object] will occur through similarity, as in the case of twins" - to this [the text] says "through similarity..."