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(2) (5 pts) Consider the wff (p +9) r. (2) Write down its contrapositive. (2b) Start with the contrapositive in (2a) and rewrite using logical

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(2) (5 pts) Consider the wff (p +9) r. (2) Write down its contrapositive. (2b) Start with the contrapositive in (2a) and rewrite using logical equiv- alences so that the final wff involves only variables, their negations, conjunctions, and disjunctions

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