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163: 3 backpack-heptacubes, 3 bulldozer-heptacubes, 3 cleaver-heptacubes
1 solution for C, 3 solutions for B and many solutions for A

  3×   3×

empty cube at C


empty cube at B
(1 of 3)

empty cube at B
(2 of 3)

empty cube at B
(3 of 3)