¬(xy→z) → (x→y) = (xy→z) v (x→y) = (¬(xy) v z) v (¬x v y) = ¬x v ¬y v z v ¬x v y = 1
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¬(xy→z) → (x→y) = (xy→z) v (x→y) = (¬(xy) v z) v (¬x v y) = ¬x v ¬y v z v ¬x v y = 1