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25: 4 T-tetracubes, 2 U-pentacubes
2 solutions for C and 4 solutions for B

  2×

empty cube at C
(1 of 2)

empty cube at C
(2 of 2)

empty cube at B
(1 of 4)

empty cube at B
(2 of 4)

empty cube at B
(3 of 4)

empty cube at B
(4 of 4)