Shown with a cast-on count of 24 stitches.  

• Row 1 (RS): K4, p18, yo, p2tog, CO 1 st (25 sts).
• Rows 2, 4, 6, and 8: P2tog, k19, turn (20 sts).
• Rows 3, 5, 7, and 9: P18, yo, p2tog, CO 1 st (21 sts).
• Row 10: P2tog, p17, M1L, k1, k2tog, k3 (24 sts).
• Row 11: K22, yo, p2tog, CO 1 st (25 sts).
• Rows 12, 14, 16, and 18: P2tog, p19, turn (20 sts).
• Rows 13, 15, 17, and 19: K18, yo, p2tog, CO 1 st (21 sts).
• Row 20: P2tog, k17, M1L, k1, k2tog, k3 (24 sts).
• Repeat rows 1-20.