Shown with a cast-on count of 0 stitches.  

• Row 1 (RS): CO 23 sts (23 sts).
• Rows 2 and 4: K23.
• Rows 3 and 5: P23.
• Row 6 (RS): K1, [p1 PB] 21 times, k1.
• Row 7: K1, [p1 PB] 21 times, k1.
• Row 8: K2, [p1 PB] 19 times, k2.
• Rows 9 and 15: K2, p1 PB, k1, p1 PB, k5, [p1 PB] twice, k5, p1 PB, k1, [p1 PB] twice, k2.
• Rows 10 and 16: K2, p1 PB, k1, [p1 PB] 14 times, k1, [p1 PB] twice, k2.
• Rows 11, 13, 17, and 19: K2, p1 PB, k1, [p1 PB] 5 times, k1, [p1 PB] 6 times, k1, p1 PB, k1, [p1 PB] twice, k2.
• Rows 12 and 18: K2, p1 PB, k1, [p1 PB] 5 times, k1, [p1 PB] 6 times, k1, p1 PB, k1, [p1 PB] twice, k2.
• Rows 14 and 20: K2, p1 PB, k1, p1 PB, k1, [p1 PB] 5 times, k1, [p1 PB] 6 times, k1, [p1 PB] twice, k2.