Shown with a cast-on count of 23 stitches.  

• Row 1 (RS): K4, yo, ssk, k1, *k2, k2tog, yo, k1, yo, ssk, k1, repeat from * to last 8 sts, k2, k2tog, yo, k4.
• Rows 2, 4, 6, 8, 10, and 12: K2, p19, k2.
• Row 3: K4, yo, k1, ssk, *k1, k2tog, [k1, yo] twice, k1, ssk, repeat from * to last 8 sts, k1, k2tog, k1, yo, k4.
• Row 5: K4, yo, k2, *sl2-k1-p2sso, k2, yo, k1, yo, k2, repeat from * to last 9 sts, sl2-k1-p2sso, k2, yo, k4.
• Row 7: K5, k2tog, yo, *k1, yo, ssk, k3, k2tog, yo, repeat from * to last 8 sts, k1, yo, ssk, k5.
• Row 9: K4, k2tog, k1, yo, *k1, yo, k1, ssk, k1, k2tog, k1, yo, repeat from * to last 8 sts, k1, yo, k1, ssk, k4.
• Row 11: K3, k2tog, k2, yo, *k1, yo, k2, sl2-k1-p2sso, k2, yo, repeat from * to last 8 sts, k1, yo, k2, ssk, k3.