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1 + 2 + 3 + 4 + 5 + 6 + 7 = 28 = 10 = 1
1 x 2 x 3 x 4 x 5 x 6 x 7 = 5040 = 9
1 2 2 6 6 24 24 120 120 720 720 5040 5040 40320 40320 362880 46233 409112
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