What are derivations? O Sentences inferred from the inference rules O Sentences in a proof whose truth we take for granted O Sentences in a proof inferred from the conclusion O Sentences that justify the rules of logic

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What are derivations? O Sentences inferred from the inference rules O Sentences in a proof whose truth we take for granted O Sentences in a
proof inferred from the conclusion O Sentences that justify the rules of logic

 
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