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279: 3 bulldozer-heptacubes, 3 gun-heptacubes, 3 notch-heptacubes
3 solutions for B, 3 solutions for C, 3 solutions for D and 4 solutions for A
3×
3×
3×
empty cube at B
(1 of 3)
empty cube at B
(2 of 3)
empty cube at B
(3 of 3)
empty cube at C
(1 of 3)
empty cube at C
(2 of 3)
empty cube at C
(3 of 3)
empty cube at D
(1 of 3)
empty cube at D
(2 of 3)
empty cube at D
(3 of 3)
3× 
3× 