The evidence. At 17b16–20 Aristotle discusses contradictory pairs where one member is a universal predicative assertion. Here is the text handed down by the main manuscripts and printed by the majority of recent editors (Bekker, Waitz, Dübner, Cooke, Minio-Paluello, and Zadro):

Ammonius (in Int. 109, 24–5) reports that according to Porphyry at 17b17 some manuscripts instead of ‘ἀντιφατικῶς’ read ‘ἀποφαντικῶς’ (some manuscripts of Ammonius have ‘ἀποφατικῶς’, the reading we find also in some manuscripts of de Interpretatione, e.g. in Laur. 72, 17). In n ‘τῷ’ (17b17) is added above the line. Bekker claims that at 17b17–18 B reads ‘τὴν τὸ καθόλου σημαίνουσαν τῇ τὸ οὐ καθόλου’, but he is wrong: B's reading is the same as that of the other main manuscripts. (Was this reading attested in some other manuscript?) At 17b18 Laur. 72, 4 omits the first ‘οὐ’. In Vat. Palat. Gr. 74 a later hand added ‘τῇ τὸ αὐτὸ’ above ‘τῷ αὐτῷ’.