In each of the following, f: B4 B, where the Boolean variables (in order) are w,

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In each of the following, f: B4 → B, where the Boolean variables (in order) are w, x, y, and z. Determine |f-1(0)| and |f-1 (1) if, as a minimal sum of products, f reduces to
(a) 
(b) wy
(c) wz
(d) x + y
(e) xy + z
(f) xy + w
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