Shown with a cast-on count of 21 stitches.  

• Rows 1 and 9 (RS): *K4, yo, ssk, repeat from * to last 3 sts, k3.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: K2, *k2tog, yo, k1, yo, ssk, k1, repeat from * to last st, k1.
• Rows 5 and 17: K1, k2tog, yo, *k3, yo, sl1-k2tog-psso, yo, repeat from * to last 6 sts, k3, yo, ssk, k1.
• Rows 7 and 15: K3, *yo, sl1-k2tog-psso, yo, k3, repeat from *.
• Rows 11 and 19: K1, *yo, ssk, k4, repeat from * to last 2 sts, yo, ssk.
• Row 13: K2, *yo, ssk, k1, k2tog, yo, k1, repeat from * to last st, k1.