Permute Last Layer Edges

By now you should be able to solve the first two layers of the cube on your own and orient the last layer (make the top face yellow). We will permute the pieces of the last layer in two steps just like we did for orientation. We will permute the edges first and then finish the cube with the corners.

When you're ready, move on to Step 7 - Permute Last Layer Corners.

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Algorithms Used

This is the goal of this step. If you can rotate the top layer to line up all four edges, you can move on to the next step. This will happen 1 out of every 6 solves.
This is the algorithm you need for this step. With exactly one edge lined up with its center, put it in the back. Then do right side twice, top side clockwise right side up, top side clockwise, right side down, top side counterclockwise, right side down, top side counter clockwise, right side down, top side clockwise, right side down.
Because the edges might need to be permuted in one of two possible directions, you may need to do the algorithm more than once. Note that it is possible to rotate the edges so that a different edge lines up with its center and perform the algorithm only once, but let's worry about that later.
Occasionally, you will not be able to have only one edge solved no matter how you rotate the top layer. If you can only have exactly two opposite edges solved, you can put them in the front and back and perform the algorithm above so that you only have exactly one edge solved when you've executed the alg. Then just rotate so the solved edge is in the back and perform the algorithm again.