An argument that results from uniformly replacing letters in an argument form with terms or statements is a substitution instance of that form.
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Q72: All sound arguments have
Q73: An invalid argument can have false premises
Q74: The conclusion of a valid argument may
Q75: The conclusion of an unsound argument must
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Q80: A counterexample proves that an argument form
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Q82: A good counterexample employs well-known truths for
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