Shown with a cast-on count of 23 stitches.  

• Rows 1, 3, 11, and 19 (RS): Knit.
• Rows 2, 4, 10, 12, 18, and 20: Knit.
• Rows 5 and 9: *K2, k2tog, yo, k4, repeat from * to last 7 sts, k2, k2tog, yo, k3.
• Rows 6, 8, 14, and 16: Purl.
• Row 7: *K1, k2tog, yo, k1, yo, ssk, k2, repeat from * to last 7 sts, k1, k2tog, yo, k1, yo, ssk, k1.
• Rows 13 and 17: K4, *k2, k2tog, yo, k4, repeat from * to last 3 sts, k3.
• Row 15: K4, *k1, k2tog, yo, k1, yo, ssk, k2, repeat from * to last 3 sts, k3.
• Repeat rows 3-18.