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examples of this type of puzzle.Furthermore, problems in which a number of pieces have to be arranged so as to fit into a (seemingly too small) box are also classed in this category.

The image shows an example of Hoffman's packing puzzle. The aim is to pack 27 cuboids with side lengths into a box of side length , subject to two constraints:

:1) must not be equal
:2) The smallest of must be larger than

One possibility would be

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