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Nut Stack
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Nut Stack is a packing problem. The objective is to fit the bolt and the four nuts into the pentagonal box. The way to do this is to fit the nuts around the bolt and put these together into the box. Each of the nuts is pentagonal with an elongated side. When one turns the nuts around the bolt, all nuts stacked together form a pattern. Only one of all 12x16=192 possible permutations and combination...
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