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    I'm trying to find counterexamples for the following argument forms, where premises are in fact true (not merely possibly true) and the conclusion is in fact false (not just possibly false).

    I can only think of counterexamples where the conclusions are merely possibly false, but I was wondering if it is possible to have definitely false conclusions??I've been racking my brains for ages...

    1. a only if not b. Not b. Therefore, a.

    2. If neither c nor d, then e. Not e. Therefore, c.
 
 
 
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