Shown with a cast-on count of 7 stitches.  

• Rows 1 and 3 (WS): K3, p1, k3.
• Row 2: P3, k1, p3.
• Row 4: K2tog, yo, k1 below, yo, k1 below, yo, k1 below, yo, ssk (9 sts).
• Rows 5, 7, 9, and 11: K2, purl to last 2 sts, k2.
• Row 6: P2, k1, yo, k3, yo, k1, p2 (11 sts).
• Row 8: P2, k1, yo, k2tog, yo, k1, yo, ssk, yo, k1, p2 (13 sts).
• Row 10: P2, k1, yo, k2tog, yo, k3, yo, ssk, yo, k1, p2 (15 sts).
• Row 12: P2, k1, yo, [k2tog, yo] twice, k1, yo, [ssk, yo] twice, k1, p2 (17 sts).
• Row 13: K4, purl to last 4 sts, k4.
• Row 14: P4, k1, yo, k2tog, yo, k3, yo, ssk, yo, k1, p4 (19 sts).
• Row 15: K6, purl to last 6 sts, k6.
• Row 16: P4, p2tog, k1, yo, k2tog, yo, k1, yo, ssk, yo, k1, ssp, p4.
• Rows 17 and 19: K8, purl to last 8 sts, k8.
• Row 18: P6, p2tog, yo, knit to last 8 sts, yo, ssp, p6.
• Row 20: P8, yo, sl2-k1-p2sso, yo, purl.