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K3,sl1,*yo,k2,sl1,k2tog,ps so,k2,yo,k1;repeat from * to last 2 stSan, end with k2
You should be able to do 2 repeats using 8sts per repeat (16sts) plus 4sts before the repeat and 2sts after for a total of 22sts. There are 4 yarn overs (remember that these don't use a stitch) and 2 k2tog and 2 psso so your stitch count should remain the same.
The yarn over is simply bringing the yarn to the front between the needles and then over the needle to the back.