Shown with a cast-on count of 50 stitches.  

• Row 1 (WS): K50.
• Row 2: K1, k2tog, knit to last 3 sts, k2tog, k1 (48 sts).
• Rows 3, 5, 7, 9, 11, 13, 15, 17, and 19: Purl.
• Row 4: K1, k2tog, k1, *k2tog, yo, repeat from * to last 4 sts, k1, k2tog, k1 (46 sts).
• Row 6: K1, k2tog, k1, *yo, k2tog, repeat from * to last 4 sts, k1, k2tog, k1 (44 sts).
• Row 8: K1, k2tog, k3, *k2tog, yo, repeat from * to last 6 sts, k3, k2tog, k1 (42 sts).
• Row 10: K1, k2tog, knit to last 3 sts, k2tog, k1 (40 sts).
• Row 12: K1, k2tog, *yo, k2tog, repeat from * to last 3 sts, k2tog, k1 (38 sts).
• Row 14: K1, k2tog, *k2tog, yo, repeat from * to last 3 sts, k2tog, k1 (36 sts).
• Row 16: K1, k2tog, k1, *k2tog, repeat from * to last 4 sts, k1, k2tog, k1 (20 sts).
• Row 18: K1, k2tog, knit to last 3 sts, k2tog, k1 (18 sts).