You start by covering the whole paper with your opaque light blocking device. Turn enlarger light on.
Starting at 32 seconds, and counting backwards you expose one strip of the sheet.
Then at 22 seconds you move the light blocking device again to expose the next strip of the paper.
Repeat at 16, 11, 8, 5.6 seconds, and at 4 seconds the whole sheet should be illuminated, and at 0 seconds turn enlarger light off.
I don't know how much simpler it can get? What's the source of confusion?
Aha! Now I know what you are doing. You are counting backwards from the total exposure time and uncovering the paper at certain points. I thought we were talking about progressively covering the previously exposed strip, not uncovering unexposed paper.