Analysis and Copyright : ISHINO Keiichiro (2003).
8 pieces (Hexominoes) chosen on condition that the following will be assembled to
12×4×1 and 8×6×1 and 4×4×3.
That three rectangles 12×4×1 and 8×6×1 and 4×4×3 can be assembled has 309 ways under these conditions.
There are only 3 ways under the following added conditions.
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