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24: 4 L-tetracubes, 2 W-pentacubes
2 solutions for C, 3 solutions for A and 6 solutions for B

  2×

empty cube at C
(1 of 2)

empty cube at C
(2 of 2)

empty cube at A
(1 of 3)

empty cube at A
(2 of 3)

empty cube at A
(3 of 3)