Shown with a cast-on count of 2 stitches.  

• Round 0: K2.
• Round 1: Kfb, k1 (3 sts).
• Round 2: K2, kfb (4 sts).
• Round 3: K2, yo, k2 (5 sts).
• Rounds 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, and 84: Knit.
• Round 5: K2, yo, k1, yo, k2 (7 sts).
• Round 7: K2, yo, knit to last 2 sts, yo, k2 (9 sts).
• Round 9: K2, yo, knit to last 2 sts, yo, k2 (11 sts).
• Round 11: K2, yo, knit to last 2 sts, yo, k2 (13 sts).
• Round 13: K2, yo, knit to last 2 sts, yo, k2 (15 sts).
• Round 15: K2, yo, knit to last 2 sts, yo, k2 (17 sts).
• Round 17: K2, yo, knit to last 2 sts, yo, k2 (19 sts).
• Round 19: K2, yo, knit to last 2 sts, yo, k2 (21 sts).
• Round 21: K2, yo, knit to last 2 sts, yo, k2 (23 sts).
• Round 23: K2, yo, knit to last 2 sts, yo, k2 (25 sts).
• Round 25: K2, yo, knit to last 2 sts, yo, k2 (27 sts).
• Round 27: K2, yo, k1, yo, k8, ssk, k1, k2tog, k8, yo, k1, yo, k2 (29 sts).
• Round 29: K2, yo, k1, yo, ssk, yo, k7, ssk, k1, k2tog, k7, yo, k2tog, yo, k1, yo, k2 (31 sts).
• Round 31: K2, yo, k1, [yo, ssk] twice, yo, k6, ssk, k1, k2tog, k6, [yo, k2tog] twice, yo, k1, yo, k2 (33 sts).
• Round 33: K2, yo, k1, [yo, ssk] 3 times, yo, k5, ssk, k1, k2tog, k5, [yo, k2tog] 3 times, yo, k1, yo, k2 (35 sts).
• Round 35: K2, yo, k1, [yo, ssk] 4 times, yo, k4, ssk, k1, k2tog, k4, [yo, k2tog] 4 times, yo, k1, yo, k2 (37 sts).
• Round 37: K2, yo, k1, [yo, ssk] 5 times, yo, k3, ssk, k1, k2tog, k3, [yo, k2tog] 5 times, yo, k1, yo, k2 (39 sts).
• Round 39: K2, yo, k1, [yo, ssk] 6 times, yo, k2, ssk, k1, k2tog, k2, [yo, k2tog] 6 times, yo, k1, yo, k2 (41 sts).
• Round 41: K2, yo, k1, [yo, ssk] 7 times, yo, k1, ssk, k1, k2tog, k1, [yo, k2tog] 7 times, yo, k1, yo, k2 (43 sts).
• Round 43: K2, yo, k1, [yo, ssk] 9 times, k1, [k2tog, yo] 9 times, k1, yo, k2 (45 sts).
• Round 45: K2, yo, k1, [yo, ssk] 9 times, yo, sl1-k2tog-psso, [yo, k2tog] 9 times, yo, k1, yo, k2 (47 sts).
• Round 47: K2, yo, k3, [yo, ssk] 9 times, k1, [k2tog, yo] 9 times, k3, yo, k2 (49 sts).
• Round 49: K2, yo, k5, [yo, ssk] 8 times, yo, sl1-k2tog-psso, [yo, k2tog] 8 times, yo, k5, yo, k2 (51 sts).
• Round 51: K2, yo, k7, [yo, ssk] 8 times, k1, [k2tog, yo] 8 times, k7, yo, k2 (53 sts).
• Round 53: K2, yo, k9, [yo, ssk] 7 times, yo, sl1-k2tog-psso, [yo, k2tog] 7 times, yo, k9, yo, k2 (55 sts).
• Round 55: K2, yo, k11, [yo, ssk] 7 times, k1, [k2tog, yo] 7 times, k11, yo, k2 (57 sts).
• Round 57: K2, yo, k13, [yo, ssk] 6 times, yo, sl1-k2tog-psso, [yo, k2tog] 6 times, yo, k13, yo, k2 (59 sts).
• Round 59: K2, yo, k15, [yo, ssk] 6 times, k1, [k2tog, yo] 6 times, k15, yo, k2 (61 sts).
• Round 61: K2, yo, k17, [yo, ssk] 5 times, yo, sl1-k2tog-psso, [yo, k2tog] 5 times, yo, k17, yo, k2 (63 sts).
• Round 63: K2, yo, k19, [yo, ssk] 5 times, k1, [k2tog, yo] 5 times, k19, yo, k2 (65 sts).
• Round 65: K2, yo, k21, [yo, ssk] 4 times, yo, sl1-k2tog-psso, [yo, k2tog] 4 times, yo, k21, yo, k2 (67 sts).
• Round 67: K2, yo, k23, [yo, ssk] 4 times, k1, [k2tog, yo] 4 times, k23, yo, k2 (69 sts).
• Round 69: K2, yo, k25, [yo, ssk] 3 times, yo, sl1-k2tog-psso, [yo, k2tog] 3 times, yo, k25, yo, k2 (71 sts).
• Round 71: K2, yo, k27, [yo, ssk] 3 times, k1, [k2tog, yo] 3 times, k27, yo, k2 (73 sts).
• Round 73: K2, yo, k29, [yo, ssk] twice, yo, sl1-k2tog-psso, [yo, k2tog] twice, yo, k29, yo, k2 (75 sts).
• Round 75: K2, yo, k31, [yo, ssk] twice, k1, [k2tog, yo] twice, k31, yo, k2 (77 sts).
• Round 77: K2, yo, k33, yo, ssk, yo, sl1-k2tog-psso, yo, k2tog, yo, k33, yo, k2 (79 sts).
• Round 79: K2, yo, k35, yo, ssk, k1, k2tog, yo, k35, yo, k2 (81 sts).
• Round 81: K2, yo, k37, yo, sl1-k2tog-psso, yo, k37, yo, k2 (83 sts).
• Round 83: K2, yo, k79, yo, k2 (85 sts).
• Round 85: BO (0 sts).