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25: 3 F-pentacubes, 7 notch-heptacubes
5 solutions
3×
7×
empty cube at A
(1 of 5)
empty cube at A
(2 of 5)
empty cube at A
(3 of 5)
empty cube at A
(4 of 5)
empty cube at A
(5 of 5)