Shown with a cast-on count of 79 stitches.  

• Rows 1, 3, 5, and 7 (RS): K1, *p1, k1, repeat from *.
• Rows 2, 4, and 6: K1, *p1, k1, repeat from *.
• Row 8: K1, [p1, k1] 19 times, incL, [k1, p1] 20 times (80 sts).
• Rows 9, 15, 21, 27, 33, 39, 43, and 47: [K1, p1] 3 times, k68, [p1, k1] 3 times.
• Rows 10, 16, 22, 28, 34, 40, and 44: [K1, p1] twice, k2, p68, k2, [p1, k1] twice.
• Rows 11, 17, 23, 29, and 35: [K1, p1] 3 times, p1, *k6, p2, repeat from * to last 9 sts, k3, [p1, k1] 3 times.
• Rows 12, 18, 24, 30, and 36: [K1, p1] twice, k2, p2, k2, *p6, k2, repeat from * to last 6 sts, k2, [p1, k1] twice.
• Rows 13, 19, 25, 31, and 37: [K1, p1] 3 times, k1, p2, *k6, p2, repeat from * to last 7 sts, k1, [p1, k1] 3 times.
• Rows 14, 20, 26, 32, and 38: [K1, p1] twice, k4, *p6, k2, repeat from * to last 8 sts, p2, k2, [p1, k1] twice.
• Rows 41 and 45: [K1, p1] twice, k1, p70, k1, [p1, k1] twice.
• Rows 42 and 46: [K1, p1] twice, k72, [p1, k1] twice.
• Row 48: [K1, p1] twice, k2, p33, p2tog, p33, k2, [p1, k1] twice (79 sts).