Claim: Wearing evening attire is necessary to enter this club. Objection: Many people wore evening attire and still were not allowed to enter the club. Does this objection show that the claim is wrong? No, because the claim says that wearing evening attire is necessary, not sufficient. No, because wearing evening attire can be necessary and still be sufficient. Yes, because wearing evening attire is both necessary and sufficient Yes, because it is true that wearing evening attire is not sufficient for gaining mission to the club.

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