Question $12$

$1\mathrm{.}5$ pts

Solve the following proof using the $18$ inference and equivalence rules.

$($You can type the proof into the answer window below or insert an image or document using Upload image or Upload document function above.$)$

$A\frac{BvvA}{A}B$

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$12ptvv$ Paragraph $vv|B,I{?}_{?}|$

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$12$pt

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B

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$U_{?}$

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