Shown with a cast-on count of 18 stitches.  

• Rows 1 and 19 (RS): *K2, yo, k5, yo, k1, repeat from * to last 2 sts, k2 (multiple of 10 sts, plus 2).
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: P2, *[p2tog, p3] twice, repeat from * (multiple of 8 sts, plus 2).
• Rows 3 and 17: *K2, yo, k4, yo, k2, repeat from * to last 2 sts, k2 (multiple of 10 sts, plus 2).
• Rows 5 and 15: *K2, yo, k3, yo, k3, repeat from * to last 2 sts, k2 (multiple of 10 sts, plus 2).
• Rows 7 and 13: *K2, yo, k2, yo, k4, repeat from * to last 2 sts, k2 (multiple of 10 sts, plus 2).
• Rows 9 and 11: *K2, yo, k1, yo, k5, repeat from * to last 2 sts, k2 (multiple of 10 sts, plus 2).