Shown with a cast-on count of 32 stitches.  

• Rows 1 and 11 (RS): *P2, k13, repeat from * to last 2 sts, p2.
• Rows 2 and 12: K2, *p13, k2, repeat from *.
• Row 3: *P2, k10, k2tog, yo, k1, repeat from * to last 2 sts, p2.
• Row 4: K2, *yo, p2, p2tog, p9, k2, repeat from *.
• Row 5: *P2, k8, k2tog, k1, yo, k2, repeat from * to last 2 sts, p2.
• Row 6: K2, *p1, yo, p3, p2tog, p7, k2, repeat from *.
• Row 7: *P2, k6, k2tog, k2, yo, k3, repeat from * to last 2 sts, p2.
• Row 8: K2, *p2, yo, p4, p2tog, p5, k2, repeat from *.
• Row 9: *P2, k4, k2tog, k3, yo, k4, repeat from * to last 2 sts, p2.
• Row 10: K2, *p3, yo, p5, p2tog, p3, k2, repeat from *.
• Row 13: *P2, k1, yo, ssk, k10, repeat from * to last 2 sts, p2.
• Row 14: K2, *p9, p2tog tbl, p2, yo, k2, repeat from *.
• Row 15: *P2, k2, yo, k1, ssk, k8, repeat from * to last 2 sts, p2.
• Row 16: K2, *p7, p2tog tbl, p3, yo, p1, k2, repeat from *.
• Row 17: *P2, k3, yo, k2, ssk, k6, repeat from * to last 2 sts, p2.
• Row 18: K2, *p5, p2tog tbl, p4, yo, p2, k2, repeat from *.
• Row 19: *P2, k4, yo, k3, ssk, k4, repeat from * to last 2 sts, p2.
• Row 20: K2, *p3, p2tog tbl, p5, yo, p3, k2, repeat from *.