Shown with a cast-on count of 18 stitches.  

• Rows 1, 3, 11, and 13 (RS): K1, *k1, p1, repeat from * to last st, k1.
• Rows 2 and 12: Purl.
• Rows 4, 6, 8, and 10: P1, *k3, sl1 wyif, sl1 wyif, k3, repeat from * to last st, p1.
• Rows 5, 7, and 9: K1, *p3, sl1 wyib, sl1 wyib, p3, repeat from * to last st, k1.
• Rows 14, 16, 18, and 20: P1, sl1 wyif, *k6, sl1 wyif, sl1 wyif, repeat from *.
• Rows 15, 17, and 19: K1, sl1 wyib, *p6, sl1 wyib, sl1 wyib, repeat from *.