Shown with a cast-on count of 55 stitches.  

• Rows 1, 3, 5, 11, 13, and 15 (RS): [P1, k1] twice, p1, k5, *[[p1, k1] twice, p1, k5] twice, repeat from * to last 5 sts, [p1, k1] twice, p1.
• Rows 2, 4, 12, and 14: [P1, k1] twice, p1, *p6, k1, p1, k1, p7, [k1, p1] twice, repeat from * to last 10 sts, p6, [k1, p1] twice.
• Rows 6, 8, and 10: [P1, k1] twice, p1, *p5, k15, repeat from * to last 10 sts, p6, [k1, p1] twice.
• Rows 7 and 9: [P1, k1] twice, p1, k5, *p15, k5, repeat from * to last 5 sts, [p1, k1] twice, p1.
• Rows 16, 18, and 20: [P1, k1] twice, p1, *k10, p5, k5, repeat from * to last 10 sts, k5, [p1, k1] twice, p1.
• Rows 17 and 19: [P1, k1] twice, p6, *p5, k5, p10, repeat from * to last 5 sts, [p1, k1] twice, p1.