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282: 3 chair-heptacubes, 3 heart-heptacubes, 3 notch-heptacubes
3 solutions for B and 4 solutions for D
3×
3×
3×
empty cube at B
(1 of 3)
empty cube at B
(2 of 3)
empty cube at B
(3 of 3)
3× 
3× 