Shown with a cast-on count of 73 stitches.  

• Row 1 (RS): K2, ssk, yo, k3, yo, k2, k2tog, yo, ssk, k2, yo, k3, yo, *sl2-k1-p2sso, yo, k3, yo, k2, k2tog, yo, ssk, k2, yo, k3, yo, repeat from * to last 21 sts, sl2-k1-p2sso, yo, k3, yo, k2, k2tog, yo, ssk, k2, yo, k3, yo, k2tog, k2 (multiple of 18 sts, plus 41).
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Purl.
• Row 3: K2, *k3, ssk, yo, k2, ssk, yo, k1, yo, k2tog, k2, yo, k2tog, k2, repeat from * to last 3 sts, k1, k2.
• Row 5: K2, *k2, ssk, yo, k2, ssk, k1, yo, k1, yo, k1, k2tog, k2, yo, k2tog, k1, repeat from * to last 3 sts, k1, k2.
• Row 7: K2, *k1, ssk, yo, k2, ssk, k2, yo, k1, yo, k2, k2tog, k2, yo, k2tog, repeat from * to last 3 sts, k1, k2.
• Row 9: K2, ssk, yo, k2, ssk, k3, yo, k1, yo, k3, k2tog, k2, yo, *sl2-k1-p2sso, yo, k2, ssk, k3, yo, k1, yo, k3, k2tog, k2, yo, repeat from * to last 22 sts, sl2-k1-p2sso, yo, k2, ssk, k3, yo, k1, yo, k3, k2tog, k2, yo, k2tog, k2.
• Row 11: K2, *k3, ssk, k4, yo, k1, yo, k4, k2tog, k2, repeat from * to last 3 sts, k1, k2.
• Row 13: K2, *k2, ssk, k2tog, k2, yo, k1, yo, k1, yo, k1, yo, k2, ssk, k2tog, k1, repeat from * to last 3 sts, k1, k2.
• Row 15: K2, *k1, ssk, k2tog, k2, yo, k2, yo, k1, yo, k2, yo, k2, ssk, k2tog, repeat from * to last 3 sts, k1, k2.
• Row 17: K2, *k1, k2tog, k2, yo, k3, yo, sl2-k1-p2sso, yo, k3, yo, k2, ssk, repeat from * to last 3 sts, k3.