Opposites are opposite in four ways: for [they are opposites] either as [they are] an affirmation and a denial, or as [they are] contraries, or as [they are] a possession and a privation, or as they relate to something. And for each antithesis [there is] a proper inference, from which inference it indicates how it is possible for those who start to support or demolish [an argument]. But the inference [does not apply] similarly to all the antitheses; rather the inference which is made applies to the contradiction. For if [we take the premise] "the evil[1] [is] sweet", [then we also have] "that which is not sweet [is] not good", but not "that which is not good [is] not sweet". And so forth on the[ir] topics.