Question: (a) We said that every proposition is either true or false. This is known as the law of excluded middle, since it excludes a middle

(a) We said that every proposition is either true or false. This is known as the law of excluded middle, since it excludes a "middle option" where a proposition can be neither true nor false. For example, it's helpful to prove implication breakout. Using natural deduction, prove the following: p p p q p q

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