In this example:
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The rule of thumb is simple: choose one edge and bring it at its position via the longest path.
the RB edge does not go directly from its position rus , to its natural destination: ref
Instead RB goes from - rus to muf with the sledgehammer (U F' U' F) and from - rus to ref with the sledgehammer (F R' F' R)
In this example:
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The rule of thumb is simple: choose one edge and bring it to its correct position via the longest path.
The RB edge does not go directly from rus to its natural destination, ref.
Instead, RB goes from rus to muf using the Sledgehammer (U F' U' F), and then from rus to ref using the Sledgehammer (F R' F' R).