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+Transformations can be either simple rotations or a rotation composed
+with a mirroring.  A composed rotation + mirror is obtained by applying
+the corresponding rotation to the solved cube mirrored along the M plane.
+
+For example, to apply the transformation RBm (mirrored RB) to a cube C:
+        1. Apply a mirror along the M plane to the solved cube
+        2. Rotate the mirrored cube with z' y2
+        3. Apply the cube C to the transformed solved cube
+        4. Apply the transformations of step 1a and 1b in reverse