Shown with a cast-on count of 0 stitches.  

• Row 0 (WS): CO 19 sts (19 sts).
• Row 1: K2, yo, knit to last 3 sts, kfb, yo, k2 (3 more sts).
• Row 2: K2, yo, purl to last 3 sts, pfb, yo, k2 (3 more sts).
• Row 3: K2, yo, k1, ssk, knit to last 5 sts, ssk, kfb, yo, k2 (1 more st).
• Row 4: K2, yo, p2, p2tog, purl to last 6 sts, p2tog, p1, pfb, yo, k2 (1 more st).
• Row 5: K2, yo, k3, ssk, knit to last 7 sts, ssk, k2, kfb, yo, k2 (1 more st).
• Row 6: K2, yo, p4, p2tog, purl to last 8 sts, p2tog, p3, pfb, yo, k2 (1 more st).
• Row 7: K2, yo, k5, ssk, knit to last 9 sts, ssk, k4, kfb, yo, k2 (1 more st).
• Row 8: K2, yo, p6, p2tog, purl to last 10 sts, p2tog, p5, pfb, yo, k2 (1 more st).
• Row 9: K2, yo, k7, ssk, knit to last 11 sts, ssk, k6, kfb, yo, k2 (1 more st).
• Row 10: K2, yo, p8, p2tog, purl to last 12 sts, p2tog, p7, pfb, yo, k2 (1 more st).
• Row 11: K2, yo, k9, ssk, knit to last 13 sts, ssk, k8, kfb, yo, k2 (1 more st).
• Row 12: K2, yo, p10, p2tog, purl to last 14 sts, p2tog, p9, pfb, yo, k2 (1 more st).
• Repeat rows 1-2.