Shown with a cast-on count of 28 stitches.  

• Rows 1, 3, 5, 7, 9, 11, 13, and 15 (WS): Purl.
• Row 2: K1, *k6, yo, k1, yo, k6, repeat from * to last st, k1 (multiple of 15 sts, plus 2).
• Row 4: K1, *k6, yo, k3, yo, k6, repeat from * to last st, k1 (multiple of 17 sts, plus 2).
• Row 6: K1, *k6, yo, k5, yo, k6, repeat from * to last st, k1 (multiple of 19 sts, plus 2).
• Row 8: K1, *k6, yo, k7, yo, k6, repeat from * to last st, k1 (multiple of 21 sts, plus 2).
• Row 10: K1, *k6, yo, k9, yo, k6, repeat from * to last st, k1 (multiple of 23 sts, plus 2).
• Row 12: K1, *k2, k2tog, yo, k5, yo, ssk, k2tog, yo, k6, yo, ssk, k2, repeat from * to last st, k1.
• Row 14: K1, *k2tog, yo, k17, ssk, yo, ssk, repeat from * to last st, k1 (multiple of 22 sts, plus 2).
• Row 16: K1, *k2tog, k6, yo, k6, yo, k6, ssk, repeat from * to last st, k1.