Show a coloring of the 9-subgraph from Figure 1a in which one vertex x, y, or z is t, the color of the other two vertices is f, and color(p) = f.
Figure 1 (a) A 9-subgraph; (b) a graph corresponding to the Boolean expression (¬w ⋁ x ⋁ y) ⋀ (¬w ⋁ ¬y ⋁ z) ⋀ (w ⋁ ¬y ⋁ ¬z).

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