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Professor Mental Flop
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The fourth mental flop, built up from a 3x3x5.

This puzzle is meant to be the next step after three other mental flops. Unlike the 2x2xN mental flops, this one can't have proportional cubies. It is built by hand with epoxy which in turn was filled expired chicken noodles.
Size: 57 x 95 x 134 mm
Weight: 456 grams

In 2021 Ilya Toporgilka figured that if done with even number of layers, it can be made proportional. He made his professor mental flop but with 2 layers. Please refer to a separate entry in the museum.

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