I won't tell them—not unless you say I can. In this example the 'not' is superfluous. The 'not' is an abbreviated repetition of the negative in the preceding sentence.
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contraposition What does 'not unless' mean?I won't tell them—not unless you say I can.In this example the 'not' is superfluous. The 'not' is an abbreviated repetition of the negative in the preceding sentence.