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Construction problem?
Konstruktionsproblem?
The most famous cube with a name ought to be Rubik's Cube, that was sold in over 100 million copies in the beginning of the 1980's. Even though there were other similar models when Rubik Ernő patented his idea, it was his version that turned out to be the leading product. For those of you who do not remember, one had to gather the squares with the same colour on each of the cube's six faces. It has recently been shown that one does need no more than 26 moves regardless of starting position to complete this task. There are both smaller and larger versions of this toy, but it is the original 3x3x3-type that people remember.
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