Shown with a cast-on count of 4 stitches.  

• Row 1 (RS): K1, *yo, k1, repeat from * (multiple of 2 sts, plus 1).
• Rows 2, 6, 12, 14, and 16: K1, purl to last st, k1.
• Rows 3 and 9: K1, *yo, k2tog, repeat from *.
• Rows 4 and 10: K1, (p1, k1, p1) in next st, *p1, (p1, k1, p1) in next st, repeat from * to last st, k1 (multiple of 4 sts, plus 5).
• Rows 5, 7, 11, 13, and 15: Knit.
• Row 8: Knit.
• Row 17: K1, M1L, *yo, k2, repeat from * (multiple of 3 sts, plus 2).
• Row 18: K1, p1, (p1, k1) in next st, *k2, (p1, k1) in next st, repeat from * to last 2 sts, k1, p1 (multiple of 4 sts, plus 6).