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A comment on Math Problems for children from 5 to 15 (2004) [pdf]. Parent comment

Re:Math Problems for children from 5 to 15 (2004) [pdf] by maratc on Monday July 19, 2021 @02:33PM (#27885835)
The point with this question is that if volume 1 is on the left and volume 2 is on the right, the first page of volume 1 is facing right and the last page of volume 2 is facing left, so the only thing between them is the two covers. Hence, the answer is 4 mm.
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