Question: Let A1, A and B be sets with {1, 2, 3, 4, 5} = A1 A, B = {s, t u, v, w, x},

Let A1, A and B be sets with {1, 2, 3, 4, 5} = A1 ⊂ A, B = {s, t u, v, w, x}, and f: A1 → B. If f can be extended to A in 216 ways, what is |A|?

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