Shown with a cast-on count of 34 stitches.  

• Rows 4, 6, 8, 10, 12, 14, 16, and 18 (RS): K2, purl to last 2 sts, k2.
• Row 5: P2, k2, [ssk, k9] twice, ssk, knit to last 2 sts, p2 (3 fewer sts).
• Row 7: P2, k2, [ssk, k8] twice, ssk, knit to last 2 sts, p2 (3 fewer sts).
• Row 9: P2, k2, [ssk, k7] twice, ssk, knit to last 2 sts, p2 (3 fewer sts).
• Row 11: P2, k2, ssk, k6, ssk, knit to last 2 sts, p2 (2 fewer sts).
• Row 13: P2, k2, ssk, k5, ssk, knit to last 2 sts, p2 (2 fewer sts).
• Rows 15, 17, and 19: P2, k2, ssk, knit to last 2 sts, p2 (1 less st).
• Row 20: Purl to last 2 sts, k2.