γνοίης ὅσσον ὄνων κρέσσονες ἡμίονοι → you know how much better are donkeys from mules
ὁπηοῦν: ὅπηπερ, ὅπη ποτέ, ἴδε ἐν λ. ὅπη ΙΙΙ.