Two vertical pairs, left 1
Step 1 / 6
Rw: 2 Right layers: turn 90°, front face goes up
The upper piece of the front left edge pairs with the left piece of the bottom front edge. The lower piece pairs with the right piece of the top front edge.
White on top, the edge with two mismatched pieces at the front left. The first Rw and the last Rw' are both two layers.
Step 1 of 6: Rw. 2 Right layers: turn 90°, front face goes up