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Superflip is a position of the Rubik's cube where all edges are flipped in place. It is known to require 20 moves to be optimally solved and its symmetry is the reason that some believe it to be the "hardest" scramble of a Rubik's cube.

Scramble: U R2 F B R B2 R U2 L B2 R U' D' R2 F R' L B2 U2 F2