Shown with a cast-on count of 6 stitches.  

• Row 1 (RS): *Yo, k1, repeat from * (12 sts).
• Rows 2, 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, and 66: Purl.
• Row 3: *Yo, k2, repeat from * (18 sts).
• Row 5: *Yo, k3, repeat from * (24 sts).
• Row 7: *Yo, k4, repeat from * (30 sts).
• Row 9: *Yo, k5, repeat from * (36 sts).
• Row 11: *Yo, k6, repeat from * (42 sts).
• Row 13: *Yo, k7, repeat from * (48 sts).
• Row 15: *Yo, k1, yo, k5, k2tog, repeat from * (54 sts).
• Row 17: *Yo, k3, yo, k4, k2tog, repeat from * (60 sts).
• Row 19: *Yo, k5, yo, k3, k2tog, repeat from * (66 sts).
• Row 21: *Yo, k7, yo, k2, k2tog, repeat from * (72 sts).
• Row 23: *Yo, k9, yo, k1, k2tog, repeat from * (78 sts).
• Row 25: *Yo, k11, yo, k2tog, repeat from * (84 sts).
• Rows 27, 29, 31, and 33: [Yo, k3, k2tog, k3] 10 times, yo, k2, k2tog.
• Row 35: BO 16 sts, *k3, k2tog, k3, yo, repeat from * to last 3 sts, k3 (68 sts).
• Rows 37, 39, and 41: K1, *k3, k2tog, k3, yo, repeat from * to last 3 sts, k3.
• Row 43: K3, k2tog, *k3, yo, k3, k2tog, repeat from * to last 7 sts, k3, yo, k4.
• Row 45: K2, k2tog, *k3, yo, k3, k2tog, repeat from * (67 sts).
• Row 47: K1, k2tog, *k3, yo, k3, k2tog, repeat from * (66 sts).
• Rows 49, 59, 61, 63, and 65: K5, yo, *k3, k2tog, k3, yo, repeat from * to last 5 sts, k3, k2tog.
• Rows 51, 53, 55, and 57: K1, k2tog, *k3, yo, k3, k2tog, repeat from * to last 7 sts, k3, yo, k4.