Shown with a cast-on count of 38 stitches.  

• Row 1 (RS): *K2tog, k3, k2tog, k1, yo, k1, yo, k1, k2tog, k3, yo, k1, yo, k1, yo, k2, repeat from * (multiple of 21 sts).
• Rows 2, 4, 6, 8, 10, and 12: *P21, repeat from *.
• Row 3: *K2tog, k1, k2tog, k1, yo, k3, yo, k1, k2tog, k1, k2tog, k1, yo, k3, yo, k2, repeat from *.
• Row 5: *Sl2-k1-p2sso, k1, yo, k5, yo, k1, sl2-k1-p2sso, k1, yo, k5, yo, k2, repeat from *.
• Row 7: *K2, yo, k1, yo, k1, k2tog, k3, k2tog, k1, yo, k1, yo, k1, k2tog, k3, k2tog, repeat from *.
• Row 9: *K2, yo, k3, yo, k1, k2tog, k1, k2tog, k1, yo, k3, yo, k1, k2tog, k1, k2tog, repeat from *.
• Row 11: *K2, yo, k5, yo, k1, sl2-k1-p2sso, k1, yo, k5, yo, k1, sl2-k1-p2sso, repeat from *.