Cube 2x2 Corners

The standard 3x3 corner algorithm (u r u' l' u r' u' l) is enough to solve the final corners, but is used in two different patterns.

1) Rotating 3 corners. The algorithm will keep the front-right corner fixed and rotate the other 3 corners.

2) Swapping 2 corners. The algorithm will keep the two back corners fixed and swap the two front corners.

Obviously both of these are actually the same change, but thinking of them as two different techniques is useful.