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COMMENTS
| r,l,u,d,f,b are respectively right, left, up, down, front, back faces of a 3 X 3 Rubik's cube. Set M=2, R=3, L=5, U=7, D=11, F=13, B=17, where M is 90 degrees turn of the middle slice of Rubik's cube; R is 90 degrees turn of the right face, L is 90 degrees turn of the left face...
The moves to flip the top uf, ub edges are: (M*U)*(M*U)*(M*U)*U*(M^3*U)*(M^3*U)*(M^3*U)*U=(2*7)*(2*7)*(2*7^2)*(2^3*7)*(2^3*7)*(2^3*7^2)=14*14*98*56*56*392; Note that as the order of 90 degrees turn T is 4, then T^2=T^-2 and T^3=T^-1. Moves adapted from 'Adventure in group theory'.
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