Hello. I am using mattress stitch to assemble my first sweater I knit. I am having a problem though. I have ribbing on the bottom of the sweater. It's a mens sweater. Can someone tell me how to do the mattress stitch without disrupting the k2 p2 sequence, meaning so that it's k2p2 at the seam edge. By the way. I do know how to do the mattress stitch on regular stockinette, but not ribbing. I am so confused. please help meu:?? :???: :??