Shown with a cast-on count of 31 stitches.  

• Row 1 (RS): K1, *k1, k2tog, [k1, yo] twice, k1, ssk, k2, repeat from *.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Rows 3 and 17: K1, *k2tog, k1, yo, k3, yo, k1, ssk, k1, repeat from *.
• Rows 5 and 19: K2tog, *k1, yo, k5, yo, k1, sl1-k2tog-psso, repeat from * to last 9 sts, k1, yo, k5, yo, k1, ssk.
• Rows 7 and 13: K1, *k1, yo, k1, ssk, k1, k2tog, k1, yo, k2, repeat from *.
• Rows 9 and 15: K1, *k1, yo, k2, sl1-k2tog-psso, k2, yo, k2, repeat from *.
• Row 11: K1, *yo, k1, ssk, k3, k2tog, k1, yo, k1, repeat from *.