Give the indirect proofs of:
p→q,¬r→¬q,¬r⇒¬p.p→q,¬r→¬q,¬r⇒¬p.
p→¬q,¬r→q,p⇒r.p→¬q,¬r→q,p⇒r.
a∨b,c∧d,a→¬c⇒b.
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