3860/CH2/EX2.30/Ex2_30.txt


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 wxy' + xyz + w'x'z'

 = x(wy' + yz) + w'x'z'

 = x(y' + z)(y + w) + w'x'z'

 = (x + w'z')[x' + (y' + z )(y + w)]

 = (x + w')(x + z')(x' + y' + z )(x' + y + w)]