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12 * 11 * 10 / 6 * 12^7 - 12 * 11 * 10 / 6 * 9! / 2 = 12^7 * 220 - 220 * 9!/2!
12 * 11 * 10 / 6 * 12^7 - 12 * 11 * 10 / 6 * 9! / 2 = 12^7 * 220 - 220 * 9!/2!
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