What percentage (approximately) of the theoretical 43,252,003,274,489,856,000 configurations of Rubik's cube have ever turned up on a real cube? - Quora
First Sub 30! : r/Cubers
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How to solve a Rubik's Cube in world record time - YouTube
What are some interesting facts about Rubik's cube? - Quora
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Yeah... I'll admit, this is kinda ugly... : r/Cubers
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