{6\choose 7-1}\cdot7!+{6\choose 6-1}\cdot7!+{6\choose 5-1}\cdot7!+{6\choose 4-1}\cdot7!+{6\choose 3-1}\cdot7!+{6\choose 2-1}\cdot7!+{6\choose 1-1}\cdot7!

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