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[" 20.The contrapositive uf "p rarr(-q r...

[" 20.The contrapositive uf "p rarr(-q rarr-r)" is "],[[" 1) "(-q^^r)rarr-p," 2) "(q^^-r)rarr-p," 3) "p rarr(-r vv q)," 4) p^^(qvr) "]]

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