Shown with a cast-on count of 43 stitches.  

• Rows 1, 5, 7, and 9 (RS): *K1, p1, repeat from * to last st, k1.
• Rows 2, 4, 6, 8, and 10: *P1, k1, repeat from * to last st, p1.
• Row 3: [K1, p1] 21 times, k1.
• Row 21: BO 16 sts, *p1, k1, repeat from * (27 sts).
• Row 22: BO 16 sts, *k1, p1, repeat from * (11 sts).