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Prove the two De Morgans laws for four variables. (a) (x y z w) (x) (y) (z) (w). (b) (x y z w) (x) (y)

Prove the two De Morgans laws for four variables.

(a) (x y z w) (x) (y) (z) (w).

(b) (x y z w) (x) (y) (z) (w).

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