FACE & SLICE ROTATION COMMANDS
F Front
S Standing (rotate according to Front Face's orientation)
B Back
L Left
M Middle (rotate according to Left Face's orientation)
R Right
U Up
E Equator (rotate according to Up Face's orientation)
D Down
ENTIRE CUBE ROTATION COMMANDS
X Rotate entire cube according to Right Face's orientation
Y Rotate entire cube according to Up Face's orientation
Z Rotate entire cube according to Front Face's orientation