!(A | B) = !A & !B;
!(A & B) = !A | !B;
A & (B | C) = (A & B) | (A & C);
A | (B & C) = (A | B) & (A | C);
A = (!A & B) | (A & B);
A ^ B = B ^ A = (!A & B ) & (A & !B);
A ^ (!A & B ) & (A & !B) = B;
B ^ (!A & B ) & (A & !B) = A;
A ^ B ^ B = A;
!(A ^ B) = (A | !B) & (!A | B)
= (A & B) | (!A & !B);
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