OLL parity: one flipped edge pair
Step 1 / 15
r2: Right inner layer: turn 180° (Written as TR2 in the textbook)
The top is almost one color. Only the edge pair in the middle of one side shows the top color on the side face.
Turn the cube so the flipped pair is on top, at the front, closest to you.
Step 1 of 15: r2. Right inner layer: turn 180°