z + ¬y + x¬z + y¬x = (z + x¬z) + (¬y + y¬x) = (z + x) + (¬y + ¬x) =
z + (x + ¬x) + ¬y = z + 1 + ¬y = 1
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z + ¬y + x¬z + y¬x = (z + x¬z) + (¬y + y¬x) = (z + x) + (¬y + ¬x) =
z + (x + ¬x) + ¬y = z + 1 + ¬y = 1