ὁ γὰρ μανθάνων κιθαρίζειν κιθαρίζων μανθάνει κιθαρίζειν → he who is learning the harp, learns the harp by harping
Ar. πυγή, ἡ, ὄρρος, ὁ, πρωκτός, ὁ, V. γλουτός, ὁ (Soph., Fragment).