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277: 3 bulldozer-heptacubes, 3 gun-heptacubes, 3 hitchhiker-heptacubes
3 solutions for A
3×
3×
3×
empty cube at A
(1 of 3)
empty cube at A
(2 of 3)
empty cube at A
(3 of 3)
3× 
3× 