Shown with a cast-on count of 40 stitches.  

• Rows 19 and 27 (RS): P10, *k4, p4, repeat from * to last 14 sts, k4, p10.
• Rows 20 and 28: K10, *p4, k4, repeat from * to last 14 sts, p4, k10.
• Row 21: P10, *k4, p2, CO 1 st, p2, repeat from * to last 14 sts, k4, p10 (multiple of 9 sts, plus 24).
• Row 22: K10, *p4, k2, p1, k2, repeat from * to last 14 sts, p4, k10.
• Row 23: P10, *k4, p2, (k1, yo, k1) in next st, p2, repeat from * to last 14 sts, k4, p10 (multiple of 11 sts, plus 24).
• Row 24: K10, *p4, k2, p1, pfb, p1, k2, repeat from * to last 14 sts, p4, k10 (multiple of 12 sts, plus 24).
• Row 25: P10, *k4, p1, CO 1 st, p1, k4, p1, CO 1 st, p1, repeat from * to last 14 sts, k4, p10 (multiple of 14 sts, plus 24).
• Row 26: K10, *p4, k1, kfb, k1, p4, k1, kfb, k1, repeat from * to last 14 sts, p4, k10 (multiple of 16 sts, plus 24).