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9, only one duplicated.
The pieces have the follow sizes: 19x29x44, 19x29x88, 19x58x44, 38x29x44, 19x58x88, 38x29x88, 38x58x44, 38x58x88. The sum a volume of 57x57x132 and the box is 58x88x133. The difference happens to be the volume of the duplicated piece, a second copy of the 19x29x44 one. |
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