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Is it possible to have a function f: A B where the domain satisfies |A| = 3 and the codomain satisfies |B| = 2?

Is it possible to have a function f: A B where the domain satisfies |A| = 3 and the codomain satisfies |B| = 2? If you think this is possible, provide an explicit example (make up your own sets A and B, and make up your own function f). If you think this is impossible explain why.

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