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    Which 3x3x3 positions require at least 20 moves to solve?

    I know that any rubik's cube position can be solved in 20 moves or less, but which are the allowable moves? I'm assuming it includes FBUDRL and all of their inverses (i.e., F'B'U' etc.). What about F2B2U2...? What about fbudrl and their inverses and doubles? And what about xyz? Thanks...
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