6!/6^6=(5/6)*(4/6)*(3/6)*(2/6)*1/6=(5/6)*(2/3)*(1/2)*(1/3)*1/6
6!/6^6=(5/6)*(4/6)*(3/6)*(2/6)*1/6=(5/6)*(2/3)*(1/2)*(1/3)*1/6
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