Shown with a cast-on count of 17 stitches.  

• Row 1 (RS): P1, *k1, k2tog, k1, yo, k3, p1, repeat from *.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Purl.
• Row 3: P1, *k3, yo, k2tog, yo, k2, p1, repeat from * (multiple of 9 sts, plus 1).
• Row 5: P1, *k1, yo, k2, k2tog, ssk, yo, k1, p1, repeat from *.
• Row 7: P1, *k1, yo, k2tog, k1, ssk, yo, k2tog, p1, repeat from * (multiple of 8 sts, plus 1).
• Row 9: P1, *k3, yo, k1, ssk, k1, p1, repeat from *.
• Row 11: P1, *k2, yo, ssk, yo, k3, p1, repeat from * (multiple of 9 sts, plus 1).
• Row 13: P1, *k1, yo, ssk, k2tog, k2, yo, k1, p1, repeat from *.
• Row 15: P1, *ssk, yo, k2tog, k1, ssk, yo, k1, p1, repeat from * (multiple of 8 sts, plus 1).