Shown with a cast-on count of 51 stitches.  

• Row 1 (RS): K11, p1, *k13, p1, repeat from * to last 11 sts, k11.
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, and 28: Purl.
• Row 3: K10, p3, *k11, p3, repeat from * to last 10 sts, k10.
• Row 5: K9, p5, *k9, p5, repeat from * to last 9 sts, k9.
• Row 7: K8, p7, *k7, p7, repeat from * to last 8 sts, k8.
• Row 9: K7, p9, *k5, p9, repeat from * to last 7 sts, k7.
• Row 11: K6, p11, *k3, p11, repeat from * to last 6 sts, k6.
• Row 13: K5, *p13, k1, repeat from * to last 4 sts, k4.
• Row 15: K4, p1, *k13, p1, repeat from * to last 4 sts, k4.
• Row 17: K4, p2, k11, *p3, k11, repeat from * to last 6 sts, p2, k4.
• Row 19: K4, p3, k9, *p5, k9, repeat from * to last 7 sts, p3, k4.
• Row 21: K4, p4, k7, *p7, k7, repeat from * to last 8 sts, p4, k4.
• Row 23: K4, p5, k5, *p9, k5, repeat from * to last 9 sts, p5, k4.
• Row 25: K4, p6, k3, *p11, k3, repeat from * to last 10 sts, p6, k4.
• Row 27: K4, p7, k1, *p13, k1, repeat from * to last 11 sts, p7, k4.
• Repeat rows 1-28.