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Rules to play Rubiks Cube
At this stage, all U and D edges (except perhaps the exchange required at the end of last section) have been settled. Physically rotate the cube sideways to view the remaining four M edges as C edges.w that both the the R and L faces (ie the original U and D faces) have been (largely) settled, we shift to a new paradigm. Regard these two faces as two metal plates with the C slice in between. Only this C slice have edges to be solved. They can always be solved with either of the following algorithms with suitable conjugates of Cn.
Noting that C moves one C edge to another,