Shown with a cast-on count of 2 stitches.  

• Rows 1 and 13 (RS): *Yo, k1, repeat from * (multiple of 2 sts).
• Rows 2, 6, 10, 12, 14, 16, and 18: Knit.
• Rows 3, 5, 7, 9, 11, 15, and 17: Knit.
• Rows 4 and 8: *Yo, k1, repeat from * (multiple of 2 sts).
• Row 19: *K2tog, k3, k2tog, yo, k1, yo, repeat from *.
• Row 20: *K5, yo, k3, yo, repeat from * (multiple of 10 sts).