Shown with a cast-on count of 51 stitches.  

• Row 1 (RS): K51.
• Row 2: P51.
• Rows 3, 5, 7, and 9: K3, k2tog, k20, M1L, k1, M1R, k20, ssk, k3.
• Rows 4, 6, 8, 10, 12, 14, 16, 18, and 20: Purl.
• Row 11: K3, k2tog, k41, ssk, k3 (49 sts).
• Row 13: K3, k2tog, k39, ssk, k3 (47 sts).
• Row 15: K3, k2tog, k37, ssk, k3 (45 sts).
• Row 17: K3, k2tog, k35, ssk, k3 (43 sts).
• Row 19: K3, k2tog, k33, ssk, k3 (41 sts).
• Row 21: K3, k2tog, k31, ssk, k3 (39 sts).