Shown with a cast-on count of 68 stitches.  

• Round 0: [K1, p1] 34 times.
• Round 1: [K1, p1] 4 times, sl1-k2tog-psso, p1, *k1, p1, repeat from * to last 4 sts, k3tog, p1 (64 sts).
• Rounds 2, 6-8, 10-11, 14-16, 18-19, 23-25, and 27-28: *K1, p1, repeat from *.
• Round 4: [K1, p1] 12 times, sl1-k2tog-psso, [p1, k1] 8 times, p1, k3tog, *p1, k1, repeat from * to last st, p1 (60 sts).
• Round 5: [K1, p1] 4 times, sl1-k2tog-psso, p1, *k1, p1, repeat from * to last 4 sts, k3tog, p1 (56 sts).
• Round 9: [K1, p1] 4 times, sl1-k2tog-psso, p1, *k1, p1, repeat from * to last 4 sts, k3tog, p1 (52 sts).
• Round 12: [K1, p1] 10 times, sl1-k2tog-psso, [p1, k1] 6 times, p1, k3tog, *p1, k1, repeat from * to last st, p1 (48 sts).
• Round 13: [K1, p1] 4 times, sl1-k2tog-psso, p1, *k1, p1, repeat from * to last 4 sts, k3tog, p1 (44 sts).
• Round 17: [K1, p1] 4 times, sl1-k2tog-psso, p1, *k1, p1, repeat from * to last 4 sts, k3tog, p1 (40 sts).
• Round 20: [K1, p1] 8 times, sl1-k2tog-psso, [p1, k1] 4 times, p1, k3tog, *p1, k1, repeat from * to last st, p1 (36 sts).
• Round 21: [K1, p1] 4 times, sl1-k2tog-psso, p1, *k1, p1, repeat from * to last 4 sts, k3tog, p1 (32 sts).
• Round 26: [K1, p1] 4 times, sl1-k2tog-psso, p1, *k1, p1, repeat from * to last 4 sts, k3tog, p1 (28 sts).
• Round 29: [K1, p1] 6 times, sl1-k2tog-psso, p1, k1, p1, k1, p1, k3tog, *p1, k1, repeat from * to last st, p1 (24 sts).
• Round 30: [K1, p1] 4 times, sl1-k2tog-psso, p1, *k1, p1, repeat from * to last 4 sts, k3tog, p1 (20 sts).