|white cross||first 2 layers|
This step consists in completing the 2 layers, started by the white cross, by setting the white face corners and filling the gaps between centers with edges (location and orientation). There are 4 pairs of (corner, edge): blue/red, red/green, green/orange and orange/blue. All the algorithms are illustrated with the setting of blue/red corners and edges. The corner to set are easily identified by one of their 3 faces being white.
Corners can have 3 spin positions when they are down: set, spun clockwise or counterclockwise; when they are up we consider the 3 spin positions with respect to the white sticker: up, front or right. Edges have only 2 spin positions so they are either set or unset.
There are 41 different algorithms for this step.
Two tricky cases are worth mentioning:
evict a misplaced pair (corner, edge)
|F' U' F|