Shown with a cast-on count of 23 stitches.  

• Rows 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, and 41 (WS): Purl.
• Rows 2, 6, 10, 14, 18, 22, 26, 30, 34, and 38: Knit.
• Row 4: K1, yo, k2tog, k1, k2tog, k2tog, yo, k2tog, yo, k1, yo, k1, yo, k1, yo, k2tog, yo, k2tog, k2tog, k1, k2tog, yo, k1.
• Rows 8, 12, and 16: K1, yo, k1, k3tog, k2tog, k2tog, [yo, k1] 5 times, yo, k2tog, k2tog, k3tog, k1, yo, k1.
• Row 20: K2tog, yo, k1, yo, k1, yo, k1, yo, k2tog, yo, k2tog, k2tog, k1, k2tog, k2tog, yo, k2tog, yo, k1, yo, k1, yo, k1, yo, k2tog (25 sts).
• Rows 24, 28, and 32: K3tog, yo, k1, yo, k1, yo, k1, yo, k1, yo, k2tog, k2tog, k3tog, k2tog, k2tog, yo, k1, yo, k1, yo, k1, yo, k1, yo, k3tog.
• Row 36: K1, yo, k1, k2tog, k1, k2tog, k2tog, yo, k2tog, yo, k1, yo, k1, yo, k1, yo, k2tog, yo, k2tog, k2tog, k1, k2tog, k1, yo, k1.
• Row 40: K1, yo, k2tog, k3tog, k2tog, k2tog, [yo, k1] 5 times, yo, k2tog, k2tog, k3tog, k2tog, yo, k1 (23 sts).