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In fact, Rokicki has shown that there exist configurations requiring at least 20 moves to solve. That's why the author said that for any arbitrary cube configuration, it takes 21, 22, or 23 moves to solve it.
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In fact, Rokicki has shown that there exist configurations requiring at least 20 moves to solve. That's why the author said that for any arbitrary cube configuration, it takes 21, 22, or 23 moves to solve it.