PLL R perm

1. Ra perm:

(R U’ R’ U’) (R U R D) (R’ U’ R D’) (R’ U2 R’) (a headlight on L-face)

2. Rb perm:

(R2 F R U) (R U’ R’ F’ R) (U2 R’ U2 R) (a headlight on L-face)

The both algorithms are pretty straightforward.