This is the most common configuration. To correctly locate the edges there are two o RY and YB are the edges wrongly oriented.
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The rule of thumb: move the single correctly oriented cubie back and forth (RB)
RB Is the edge corrctly positioned and oriented. The first 'Sledgehammer' (U F' U' F) removes it from its position ref to position muf
The second 'Sledgehammer' (F R' F' R) bring it back from position muf to position ref
Flat rotation ' shows a technique with no impact on corner positions.