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255: 3 bulldozer-heptacubes, 3 hitchhiker-heptacubes, 3 napkinholder-heptacubes
2 solutions for C, 2 solutions for D and 4 solutions for A
3×
3×
3×
empty cube at C
(1 of 2)
empty cube at C
(2 of 2)
empty cube at D
(1 of 2)
empty cube at D
(2 of 2)
3× 
3× 