Terminology

"When describing the solution for the 2nd and 3rd layers, standard cube notation will be used. Heres what you need to know to read it F = front face B = back face R = right face L = left face U = up face D = down face In addition to a letter, each move may be accompanied by an apostrophe or the number two A letter by itself means turn that face 90 degrees clockwise (eg. F). A letter followed by an apostrophe means turn that face 90 degrees anticlockwise (eg. F). A letter followed by the number 2 means turn that face 180 degrees (direction is irrelevant), (eg. F2). So R U L2 is shorthand for ""turn the right face 90 degrees clockwise, then turn the up face 90 degrees anticlockwise, then turn the left face 180 degrees"". When thinking whether to turn clockwise/anticlockwise, imagine that you are looking directly at the particular face you are turning. "