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ASU 488 All Soviet Union MO 1989 77 blocks each 3x3x1 assembled 7x9x11

Source:

August 13, 2019
combinatoricscombinatorial geometryTiling

Problem Statement

Can 7777 blocks each 3×3×13 \times 3 \times1 be assembled to form a 7×9×117 \times 9 \times 11 block?
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