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A square puzzle looks like a square-1, but with one quarter of the square-2.
(1+1+1+2)/4 = 1.25.
This puzzle is a mixture of a square-1 and a square-2.
The name of this puzzle comes from the ratio of the number of parts in a square-2 attached to the square-1.
Thank you to the following people for their assistance in helping collect the information on this page: Jack.S.N.Triton.
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