Shown with a cast-on count of 33 stitches.  

• Row 1 (RS): K1, yo, k1, ssk, k2, *yo, [k2tog, k1] twice, yo, k4, repeat from * to last 7 sts, yo, [k2tog, k1] twice, yo, k1.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: K2, *yo, k1, ssk, k3, k2tog, k1, yo, k1, repeat from * to last st, k1.
• Row 5: K3, *yo, k1, ssk, k1, k2tog, k1, yo, k3, repeat from *.
• Row 7: K4, *yo, k1, sl2-k1-p2sso, k1, yo, k1, ssk, yo, k2, repeat from * to last 9 sts, yo, k1, sl2-k1-p2sso, k1, yo, k4.
• Row 9: K5, *yo, sl2-k1-p2sso, yo, k1, ssk, yo, k1, yo, k2tog, k1, repeat from * to last 8 sts, yo, sl2-k1-p2sso, yo, k5.
• Row 11: K4, *k2tog, k1, yo, k4, yo, k2tog, k1, repeat from * to last 9 sts, k2tog, k1, yo, k6.
• Row 13: K3, *k2tog, [k1, yo] twice, k1, ssk, k3, repeat from *.
• Row 15: K2, *k2tog, k1, yo, k3, yo, k1, ssk, k1, repeat from * to last st, k1.
• Row 17: K1, k2tog, *k1, yo, k1, ssk, yo, k2, yo, k1, sl2-k1-p2sso, repeat from * to last 10 sts, k1, yo, k1, ssk, yo, k2, yo, k1, ssk, k1.
• Row 19: K1, ssk, *yo, k1, ssk, yo, k1, yo, k2tog, k1, yo, sl2-k1-p2sso, repeat from * to last 10 sts, yo, k1, ssk, yo, k1, yo, k2tog, k1, yo, k2tog, k1.