Bowtie
Step 1 / 8
F': Front face: turn 90° counterclockwise (seen from the front)
Two yellow corners on a diagonal.
Hold the yellow corners at the front left and back right, with the front right corner's yellow facing front. 4Rw is the 4 right layers together, standing in for Rw on a 3x3.
Step 1 of 8: F'. Front face: turn 90° counterclockwise (seen from the front)