PLL parity: two neighboring edge pairs swapped
Step 1 / 19
U': Top face: turn 90°, front face goes right
Every corner is in place. Only the front and right edge pairs of the top layer have swapped.
The swapped pairs at the front and right. Do PLL parity, turn U, then Ua from 2-look PLL: edges.
Step 1 of 19: U'. Top face: turn 90°, front face goes right