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281: 3 bulldozer-heptacubes, 3 hitchhiker-heptacubes, 3 jay-heptacubes
3 solutions for C and 4 solutions for B
3×
3×
3×
empty cube at C
(1 of 3)
empty cube at C
(2 of 3)
empty cube at C
(3 of 3)
3× 
3× 