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250: 3 dove-heptacubes, 3 hanger-heptacubes, 3 notch-heptacubes
2 solutions for C and 2 solutions for D

3×   3×   3×

empty cube at C (1 of 2)

empty cube at C (2 of 2)

empty cube at D (1 of 2)

empty cube at D (2 of 2)