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Show that ~(p harr q) -= ( p ^^ ~q) vv(~...

Show that `~(p harr q) -= ( p ^^ ~q) vv(~p ^^q)`.

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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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