Ra permutation algorithm
PLL (permute the last layer). Group: Corners and edges.
Ra permutation: the top face is yellow all over. The algorithm swaps the front-right corner and the back-right corner, and swaps the left edge and the back edge.
The diagram shows the cube from above with the front at the bottom and yellow on top.
Algorithm
R U' R' U' R U R D R' U' R D' R' U2 R' U'
16 moves.
Other algorithms
L U2 L' U2 L F' L' U' L U L F L2R U R' F' R U2 R' U2 R' F R U R U2 R'y R U' R' U' R U R D R' U' R D' R' U2 R'
Source: www.speedsolving.com