Replying to @NoamJStein
Times e? Well, his answer may indeed not be correct, but he's doing well. Let's make it simpler and say there are four Digimon (a, b, c, d). I think the actual answer is 11 if order doesn't matter and we don't count them alone: ab ac ad bc bd cd abc abd acd bcd abcd
10:50 PM - 29 Dec 2017
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