PLL parity: two swapped edge pairs
Step 1 / 6
r2: Right inner layer: turn 180° (Written as TR2 in the textbook)
The cube is almost solved; only the front and back edge pairs of the top layer have swapped. All corners are correct.
Yellow on top, with the two swapped pairs at the front and the back.
Found by: Chris Hardwick
Step 1 of 6: r2. Right inner layer: turn 180°