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256: 3 gun-heptacubes, 3 notch-heptacubes, 3 spatula-heptacubes
2 solutions for B, 2 solutions for C and 4 solutions for D
3×
3×
3×
empty cube at B
(1 of 2)
empty cube at B
(2 of 2)
empty cube at C
(1 of 2)
empty cube at C
(2 of 2)
3× 
3× 