Rhet gre 1402a6-7καὶ ὅτι ἐπιστητὸν τὸ ἄγνωστον, (7) ἔστιν γὰρ ἐπιστητὸν τὸ ἄγνωστον ὅτι ἄγνωστον,
Rhys Roberts 1924 engAs, in dialectic, for instance, it may be argued that what—is—not is, on the ground that what—is—not is what—is—not:
http://www2.hf.uio.no/common/apps/permlink/permlink.php?app=polyglotta&context=record&uid=d06c69e9-1d51-11e7-ba66-0050569f23b2