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138: 3 bulldozer-heptacubes, 3 cleaver-heptacubes, 3 wrench-heptacubes
1 solution for C, 1 solution for D and 3 solutions for B
3×
3×
3×
empty cube at C
empty cube at D
empty cube at B
(1 of 3)
empty cube at B
(2 of 3)
empty cube at B
(3 of 3)
3× 
3× 