Shown with a cast-on count of 40 stitches.  

• Rows 1, 7, and 13 (RS): Knit.
• Rows 2, 8, and 14: Purl.
• Row 3: K9, sl1 wyib, *sl1 wyib, k8, sl1 wyib, repeat from * to last 10 sts, sl1 wyib, k9.
• Row 4: P8, sl2 wyif, *sl2 wyif, p6, sl2 wyif, repeat from * to last 10 sts, sl2 wyif, p8.
• Row 5: K8, sl2 wyib, *sl2 wyib, k6, sl2 wyib, repeat from * to last 10 sts, sl2 wyib, k8.
• Row 6: P9, sl1 wyif, *sl1 wyif, p8, sl1 wyif, repeat from * to last 10 sts, sl1 wyif, p9.
• Row 9: *K4, sl2 wyib, k4, repeat from *.
• Row 10: *P3, sl4 wyif, p3, repeat from *.
• Row 11: *K3, sl4 wyib, k3, repeat from *.
• Row 12: *P4, sl2 wyif, p4, repeat from *.
• Repeat rows 1-12.