Shown with a cast-on count of 23 stitches.  

• Row 1 (RS): K4, *yo, ssk, k5, repeat from * to last 5 sts, yo, ssk, k3.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Purl.
• Row 3: K2, *k2tog, yo, k1, yo, ssk, k2, repeat from *.
• Row 5: K1, *k2tog, yo, k3, yo, ssk, repeat from * to last st, k1.
• Row 7: K3, *yo, sl1-k2tog-psso, yo, k4, repeat from * to last 6 sts, yo, sl1-k2tog-psso, yo, k3.
• Row 9: K1, *ssk, k5, yo, repeat from * to last st, k1.
• Row 11: K1, *yo, ssk, k2, k2tog, yo, k1, repeat from * to last st, k1.
• Row 13: K2, *yo, ssk, k2tog, yo, k3, repeat from *.
• Row 15: K2tog, yo, k4, *yo, sl1-k2tog-psso, yo, k4, repeat from * to last 3 sts, yo, ssk, k1.