Shown with a cast-on count of 0 stitches.  

• Row 0 (RS): CO 39 sts (39 sts).
• Rows 1, 3, 10, and 12 (RS): Sl1 wyif, p1, *[k2, p2] twice, k1, [p2, k2] twice, p1, repeat from * to last st, k1.
• Rows 2, 4, and 11: Sl1 wyib, k1, *[p2, k2] twice, p1, [k2, p2] twice, k1, repeat from * to last st, k1.
• Rows 5, 7, 14, and 16: Sl1 wyif, [p2, k2] twice, *p3, k2, p2, k2, repeat from * to last 3 sts, p2, k1.
• Rows 6, 8, 13, and 15: Sl1 wyib, [k2, p2] twice, *k3, p2, k2, p2, repeat from * to last 3 sts, k2, k1.
• Repeat rows 1-16.