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solve (4 choose 1) * (3 choose 2) * (2 choose 2) + (4 choose 1) * (3 choose 3) * (2 choose 1)
solve (4 choose 1) * (3 choose 2) * (2 choose 2) + (4 choose 1) * (3 choose 3) * (2 choose 1)
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