Shown with a cast-on count of 32 stitches.  

• Rows 1, 3, 5, 7, 9, 11, 13, and 15 (RS): Knit.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Purl.
• Row 17: K21, ssk, k9 (31 sts).
• Row 18: P20, p2tog, p9 (30 sts).
• Row 19: K20, ssk, k8 (29 sts).
• Row 20: P19, p2tog, p8 (28 sts).
• Row 21: K19, ssk, k7 (27 sts).
• Row 22: P18, p2tog, p7 (26 sts).
• Row 23: K18, ssk, k6 (25 sts).
• Row 24: P17, p2tog, p6 (24 sts).
• Row 25: K17, ssk, k5 (23 sts).
• Row 26: P16, p2tog, p5 (22 sts).
• Row 27: K16, ssk, k4 (21 sts).
• Row 28: P15, p2tog, p4 (20 sts).
• Row 29: K15, ssk, k3 (19 sts).
• Row 30: P14, p2tog, p3 (18 sts).
• Row 31: K14, ssk, k2 (17 sts).
• Row 32: P13, p2tog, p2 (16 sts).
• Row 33: K13, ssk, k1 (15 sts).
• Row 34: P12, p2tog, p1 (14 sts).
• Row 35: K12, ssk, k0 (13 sts).
• Row 36: P11, p2tog, p0 (12 sts).