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
2ᵉ sg. impér. prés. de συνίημι;3ᵉ sg. impf. de συνίημι.