Pattern Help

I have a pattern that I am doing a decrease on for body shaping (its a a sweater) supposed to decrease every 4 rows.

Decrease Round: k to 5 sts before marker, k2tog, k3, sm, k3, SSK* twice, knit to end of round.
Repeat the decrease round every 6th [6th, 6th, 4th] round as above until you have:124 [136, 148, 168] sts.

Am I doing the decrease round then decreasing again on the 4th round after that, (so technically the 5th round) or am I decreasing on the 4th including the decrease round?

Work the decrease row, then work 3 more rows without decreasing and dec on the 4th .
One way to think about it is that you would be decreasing on rows 4,8,12,16,20 etc.

Thank you so much! Thats what I thought, but then started thinking too much about it and confused myself hahahaha