Rhet gre 1392a8-10ἂν (9) δὴ τὸ ἐναντίον ᾖ δυνατὸν ἢ εἶναι ἢ γενέσθαι, καὶ τὸ ἐναντίον (10) δόξειεν ἂν εἶναι δυνατόν,
Rhys Roberts 1924 engIt may plausibly be argued: That if it is possible for one of a pair of contraries to be or happen, then it is possible for the other:
http://www2.hf.uio.no/common/apps/permlink/permlink.php?app=polyglotta&context=record&uid=cedfb102-1d51-11e7-ba66-0050569f23b2