Shown with a cast-on count of 4 stitches.  

• Row 1 (RS): K4.
• Row 2: K4.
• Row 3: K1, M1L, k2, M1R, k1 (6 sts).
• Rows 4 and 40: K6.
• Row 5: K1, M1L, k2, yo, k2, M1R, k1 (9 sts).
• Row 6: K3, p3, k3.
• Row 7: K3, M1L, k3, M1R, k3 (11 sts).
• Row 8: K3, p5, k3.
• Row 9: K4, yo, k7 (12 sts).
• Rows 10 and 34: K3, p6, k3.
• Row 11: K3, M1L, k2, yo, k7 (14 sts).
• Rows 12 and 32: K3, p8, k3.
• Row 13: K3, M1L, k4, yo, k7 (16 sts).
• Rows 14 and 30: K3, p10, k3.
• Row 15: K3, M1L, k6, yo, k7 (18 sts).
• Rows 16, 18, 20, 22, 24, 26, and 28: K3, p12, k3.
• Row 17: K3, k2tog, k5, yo, k1, yo, k2, ssk, k3.
• Row 19: K3, k2tog, k4, yo, k3, yo, k1, ssk, k3.
• Row 21: K3, k2tog, k3, yo, k5, yo, ssk, k3.
• Row 23: K3, k2tog, k2, yo, k1, yo, k5, ssk, k3.
• Row 25: K3, k2tog, k1, yo, k3, yo, k4, ssk, k3.
• Row 27: K3, k2tog, yo, k5, yo, k3, ssk, k3.
• Row 29: K3, k2tog, k2tog, k3, yo, k1, yo, ssk, ssk, k3 (16 sts).
• Row 31: K3, k2tog, k2tog, k1, yo, k3, ssk, k3 (14 sts).
• Row 33: K3, k2tog, k1, yo, k1, ssk, ssk, k3 (12 sts).
• Row 35: K3, k2tog, yo, ssk, ssk, k3 (10 sts).
• Row 36: K3, p4, k3.
• Row 37: K3, k2tog, ssk, k3 (8 sts).
• Row 38: K3, p2, k3.
• Row 39: K2, ssk, k2tog, k2 (6 sts).
• Row 41: K1, ssk, k2tog, k1 (4 sts).
• Round 42: BO (0 sts).