A yo or yrn or yf doesn't use a stitch, it's just a wrap around the needle, then you go on to the k3 or single k1. So your stitches would be -
"yo, k3, sl1, k2tog, psso, k3, yo, k1, yo, k3, sl1, k2tog, psso, k3, yo, k1, yo k3, sl1, k2tog, psso, k3"
The yo isn't counted as a stitch, but adds one which is offset by the decs. There's the problem - there's 3 double decs (-6 sts) and 5 YOs. So either there should be another yo, or the very last dec is either a sl1, k1, psso or k2tog, but not a double dec.
sue- knitting heretic