k5, yo, k8, ssk, k5, k2tog, k8, yo
This worked on 30 sts. There are 2 decreases, ssk and k2tog, so the 2 yo's balance the decreases and you end with 30 sts. A yarnover is done between stitches and doesn't "take one stitch."
ETA: Jan and I posted the same thing, in different words, but she taught me so I guess that makes sense. Asterisks don't work here for patterns. They italicize.