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y = 1 + 1 + 1 + 1 = !x1*x2*!x3 + !x1*!x2*x3 + x1*!x2*x3 + x1*x2*x3 = ...
Później sprowadzono do negujących się bramek, czyli (!a + a = 0)
... = x2*!x3*(!x1 + x1) + x1*x3*(!x2 + x2) = x2*!x3 + x1*x3