Step 7

Step 7: Carrousel (cycle) edges

Again, this is an easy step, which needs only one algorithm. Did I say that before?

Whe have a couple of categories:

No edges are swapped. This should be easily recognisable, because YOUR CUBE IS SOLVED. You lucky bastard.
Two edges are swapped. Again, some a..hole messed with your cube. I think it's time for some martial art lessons here.
Three edges are swapped. Ok, now we're getting somewhere. Keep the solved edge in the back, then look at the front center color.
1. If the edge with that color is on the right, then use
  R' D' R D' R' D2 R y L D L' D L D2 L'
2. If it is on the left, use
  L D L' D L D2 L' y' R' D' R D' R' D2 R
Four edges are swapped in opposing pairs. Just perform the previous algorithm, and you will be left with the three edges situation (3-cycle).
Four edges are swapped in adjacent pairs. This is the famous Z-permutation, that our former world champion Dan Knights performed in under two seconds. Wow! Just perform the previous algorithm, and you will be left with the three cycle. You get the idea.

Speedcubing Tips

Again, these are absolutely not the fastest algorithms. Try the following ones (last layer on top):

3 edges: R2UFB'R2BF'UR2
4 edges opposing: RLU2R'L'F'B'U2FB
4 edges adjacent: LR'D2U2LR'DL2R2U'B2F2

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