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To orient edges, you need to put a green or blue center on top, then do U or U'.
Should the second say you can't do U or U' withOUT a blue or green on top?Remember you can't do U or U' with blue or green on top.
Fridrich, Petrus, and Roux are all very fast methods. There isn't any "fastest" method. World records have been made with Fridrich, but that doesn't mean that it's the fastest. Less people use Petrus and Roux so not a lot of people are fast. Fridich averages about 55 moves per solve, and Petrus and Roux average about 45. If Petrus and Roux users did the same turning speed and world record Fridrich users, the Petrus and Roux users could probably become faster.but, the fastest is still frid or roux?