Center 3: bar of two
Step 1 / 3
r: Right inner layer: turn 90°, front face goes up (Written as TR in the textbook)
The first two centers are on the left and right. The top is missing the left and middle spots of its front row; the front has two orange pieces in its right column.
The r slice never passes through the left and right faces, so the first two centers are safe.
Step 1 of 3: r. Right inner layer: turn 90°, front face goes up