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31: 4 L-tetracubes, 2 U-pentacubes
4 solutions for D, many solutions for A, many solutions for B and many solutions for C
4×
2×
empty cube at D
(1 of 4)
empty cube at D
(2 of 4)
empty cube at D
(3 of 4)
empty cube at D
(4 of 4)
2× 