1) Premises: q -> (q &~ q)
Conclusion: ~q
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(2) Premises: k & l
Conclusion: (k – > l) & (l -> k)
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(3) Premises: p & (q V r), p -> ~r
Conclusion: q V e
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(4) Premises: ~(p -> q)
Conclusion: ~q
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(5) Premises: (a V b) & (c V d), a -> (e -> (c &d)), c <-> ~d
Conclusion: e -> b
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