Yes. It's the same as saying, "Complete the RS row, then you are ready to start new on the WS". It confused me too the first time I saw it in a pattern! So remember: 'end on RS (or WS, depending on...
Don't quote me on this, but I believe it stands for Rally Sport; just like the RS in Chevrolet's Camaro RS. Although it is not widely circulated, this abbreviaton could be due in part to Mitsubishi's...