Shown with a cast-on count of 19 stitches.  

• Rounds 1 and 11: P1, *k1, yo, k5, yo, k1, p2, repeat from * (multiple of 11 sts, plus 1).
• Rounds 3 and 13: P1, *k1, yo, k7, yo, k1, p2, repeat from * (multiple of 13 sts, plus 1).
• Rounds 5 and 15: P1, *k1, yo, ssk, k5, k2tog, yo, k1, p2, repeat from *.
• Round 7: P1, *k1, yo, k1, yo, p9tog, p2, repeat from * (multiple of 7 sts, plus 1).
• Rounds 9 and 19: P1, *k1, yo, k3, yo, k1, p2, repeat from * (multiple of 9 sts, plus 1).
• Round 17: P1, *k9tog, yo, k1, yo, k1, p2, repeat from * (multiple of 7 sts, plus 1).