PLL parity: two neighboring corners swapped
Step 1 / 24
r2: Right inner layer: turn 180° (Written as TR2 in the textbook)
Every edge is in place. Only the two right corners of the top layer have swapped.
The swapped corners on the right. Do PLL parity, then the F perm from PLL: neighboring corner swaps. Held one U turn off, a T perm is left instead.
Step 1 of 24: r2. Right inner layer: turn 180°