Shown with a cast-on count of 7 stitches.  

• Row 1 (RS): P3, k1, p3.
• Row 2: K3, p1, k3.
• Row 3: K2tog, yo, k1 below, yo, k1 below, yo, k1 below, yo, ssk (9 sts).
• Rows 4, 6, 8, and 10: K1, purl to last st, k1.
• Row 5: P1, k1, yo, k2tog, yo, k1, yo, ssk, yo, k1, p1 (11 sts).
• Row 7: P1, k1, yo, k2tog, yo, k3, yo, ssk, yo, k1, p1 (13 sts).
• Row 9: P1, k1, [yo, k2tog] twice, yo, k1, yo, [ssk, yo] twice, k1, p1 (15 sts).
• Row 11: P1, k1, [yo, k2tog] twice, yo, k3, yo, [ssk, yo] twice, k1, p1 (17 sts).
• Row 12: K3, purl to last 3 sts, k3.
• Row 13: P3, k1, [yo, k2tog] twice, yo, k1, yo, [ssk, yo] twice, k1, p3 (19 sts).
• Rows 14 and 16: K5, purl to last 5 sts, k5.
• Row 15: P3, p2tog, k1, yo, k2tog, yo, k1, k1, k1, yo, ssk, yo, k1, ssp, p3.
• Row 17: P3, p2tog, k1, yo, k2tog, yo, k3, yo, ssk, yo, k1, ssp, purl.
• Row 18: K8, purl to last 8 sts, k8.
• Row 19: P8, yo, sl2-k1-p2sso, yo, purl.