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A Square-1 transformation by Anthony Greenhill.
Layers 2 and 4 work exactly the same as, and independently of, layers 1 and 5. It is harder to instantly recognize the shape patterns of layers 2 and 4 however. More care needed to line up for a twist of the vertical axis. This is an extremely hard puzzle.
Thank you to the following people for their assistance in helping collect the information on this page: Anthony Greenhill.
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