Shown with a cast-on count of 31 stitches.  

• Row 1 (RS): K1, k2tog, yo, k2, *k3, yo, ssk, k1, k2tog, yo, k2, repeat from * to last 6 sts, k3, yo, ssk, k1.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 3: (K1, p1) in next st, k1, sl2-k1-p2sso, *(k1, yo, k1) in next st, sl2-k1-p2sso, k1, (k1, yo, k1) in next st, k1, sl2-k1-p2sso, repeat from * to last 6 sts, (k1, yo, k1) in next st, sl2-k1-p2sso, k1, (k1, p1) in next st.
• Row 5: K1, yo, k1, sl2-k1-p2sso, yo, *k1, yo, sl2-k1-p2sso, [k1, yo] twice, k1, sl2-k1-p2sso, yo, repeat from * to last 6 sts, k1, yo, sl2-k1-p2sso, k1, yo, k1.
• Row 7: K2, yo, k1, ssk, *k1, k2tog, k1, yo, k3, yo, k1, ssk, repeat from * to last 6 sts, k1, k2tog, k1, yo, k2.
• Row 9: Ssk, yo, k1, k2tog, *(k1, yo, k1) in next st, ssk, k1, yo, sl2-k1-p2sso, yo, k1, k2tog, repeat from * to last 6 sts, (k1, yo, k1) in next st, ssk, k1, yo, k2tog.
• Row 11: K3, yo, ssk, *k1, k2tog, yo, k5, yo, ssk, repeat from * to last 6 sts, k1, k2tog, yo, k3.
• Row 13: (K1, p1) in next st, sl2-k1-p2sso, k1, *(k1, yo, k1) in next st, k1, sl2-k1-p2sso, (k1, yo, k1) in next st, sl2-k1-p2sso, k1, repeat from * to last 6 sts, (k1, yo, k1) in next st, k1, sl2-k1-p2sso, (k1, p1) in next st.
• Row 15: K1, yo, sl2-k1-p2sso, k1, yo, *k1, yo, k1, sl2-k1-p2sso, yo, k1, yo, sl2-k1-p2sso, k1, yo, repeat from * to last 6 sts, k1, yo, k1, sl2-k1-p2sso, yo, k1.
• Row 17: K1, k2tog, k1, yo, k1, *k2, yo, k1, ssk, k1, k2tog, k1, yo, k1, repeat from * to last 6 sts, k2, yo, k1, ssk, k1.
• Row 19: (K1, p1) in next st, ssk, k1, yo, *sl2-k1-p2sso, yo, k1, k2tog, (k1, yo, k1) in next st, ssk, k1, yo, repeat from * to last 7 sts, sl2-k1-p2sso, yo, k1, k2tog, (k1, p1) in next st.