Shown with a cast-on count of 0 stitches.  

• Row 0 (RS): CO 13 sts (13 sts).
• Rows 1 and 21 (RS): K13.
• Rows 2, 4, 6, 8, 12, 14, 16, 18, 22, 24, 26, 28, 32, 34, 36, and 38: P13.
• Rows 3, 5, 7, 13, 15, 17, 23, 25, 27, 33, 35, and 37: Sl1 wyib, k12.
• Rows 9 and 29: K4tog, k9 (10 sts).
• Rows 10 and 30: P10.
• Rows 11 and 31: 1-To-4 inc, k9 (13 sts).
• Rows 19 and 39: BO 12 sts (1 st).
• Row 20: K1, CO 12 sts (13 sts).
• Repeat rows 20-39.