Shown with a cast-on count of 21 stitches.  

• Rows 1 and 7 (RS): Knit.
• Rows 2 and 6: P2, *p2tog, yo, p1, yo, p2tog, p1, repeat from * to last 7 sts, p2tog, yo, p1, yo, p2tog, p2.
• Rows 3 and 5: K3, *yo, sl1-k2tog-psso, yo, k3, repeat from *.
• Rows 4 and 10: Purl.
• Rows 8 and 12: P3, *p2tog, yo, p1, yo, p2tog, p1, repeat from *.
• Rows 9 and 11: K2, *yo, sl1-k2tog-psso, yo, k3, repeat from * to last 7 sts, yo, sl1-k2tog-psso, yo, k4.