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Prove that the statement -~(pharr q) har...

Prove that the statement -`~(pharr q) harr {(p^^~q) vv (~p^^q)}` is a tautology.

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Statement `~(p harrq) ` and `(p^^~q)vv(~p^^q)` have identical truth values
`:.` `~(p harrq) -=(p^^~q) vv(~p^^q)`
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