ἔγνω δὲ φώρ τε φῶρα καὶ λύκος λύκον → the thief knows the thief and the wolf knows the wolf, and thief knows thief and wolf his fellow wolf, set a thief to catch a thief
crase att. et poét. p. τοῦ ἐπιόντος, gén. sg. part. de ἔπειμι².
