ὃ σὺ μισεῖς ἑτέρῳ μὴ ποιήσεις → don't do to others what you don't want them to do to you
interrogative: P. and V. πόθεν.
indirect: P. and V. ὁπόθεν.
relative: P. and V. ὅθεν, Ar. and V. ὅθενπερ, V. ἔνθεν (also Xen. but rare P.).