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265: 3 bulldozer-heptacubes, 3 hanger-heptacubes, 3 notch-heptacubes
2 solutions for D, 4 solutions for A, 5 solutions for C and 6 solutions for B

3×   3×   3×

empty cube at D (1 of 2)

empty cube at D (2 of 2)