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(48 choose 4) / (52 choose 4) * 4/48 - (4 choose 3) * (48 choose 44) / (52 choose 47) * 1/5
(48 choose 4) / (52 choose 4) * 4/48 - (4 choose 3) * (48 choose 44) / (52 choose 47) * 1/5
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