Shown with a cast-on count of 21 stitches.  

• Row 1 (RS): K2, *yo, ssk, k1, k2tog, yo, k1, repeat from * to last st, k1.
• Rows 2, 4, 6, 8, 10, and 12: Purl.
• Rows 3 and 9: K3, *yo, k3, repeat from * (multiple of 4 sts, plus 3).
• Row 5: K1, k2tog, *yo, ssk, k1, k2tog, yo, sl1-k2tog-psso, repeat from * to last 8 sts, yo, ssk, k1, k2tog, yo, ssk, k1 (multiple of 6 sts, plus 9).
• Row 7: K2, *k2tog, yo, k1, yo, ssk, k1, repeat from * to last st, k1.
• Row 11: K2, *k2tog, yo, sl1-k2tog-psso, yo, ssk, k1, repeat from * to last st, k1 (multiple of 6 sts, plus 3).