Shown with a cast-on count of 15 stitches.  

• Row 1 (RS): Sl1 wyif, k2, yo, k2tog, k2, yo, k2tog, k2, yo, k2tog, yo, k2 (16 sts).
• Rows 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20: Knit to last 3 sts, yo, k2tog, k1.
• Row 3: Sl1 wyif, k2, yo, k2tog, k3, yo, k2tog, k2, yo, k2tog, yo, k2 (17 sts).
• Row 5: Sl1 wyif, k2, yo, k2tog, k2, [yo, k2tog] twice, k2, yo, k2tog, yo, k2 (18 sts).
• Row 7: Sl1 wyif, k2, yo, k2tog, k3, [yo, k2tog] twice, k2, yo, k2tog, yo, k2 (19 sts).
• Row 9: Sl1 wyif, k2, yo, k2tog, k2, [yo, k2tog] 3 times, k2, yo, k2tog, yo, k2 (20 sts).
• Row 11: Sl1 wyif, k2, yo, k2tog, k2, [k2tog, yo] twice, k2, [k2tog, yo] twice, k1, k2tog (19 sts).
• Row 13: Sl1 wyif, k2, yo, k2tog, k1, [k2tog, yo] twice, k2, [k2tog, yo] twice, k1, k2tog (18 sts).
• Row 15: Sl1 wyif, k2, yo, k2tog, k2, k2tog, yo, k2, [k2tog, yo] twice, k1, k2tog (17 sts).
• Row 17: Sl1 wyif, k2, yo, k2tog, k1, k2tog, yo, k2, [k2tog, yo] twice, k1, k2tog (16 sts).
• Row 19: Sl1 wyif, k2, yo, k2tog, k4, [k2tog, yo] twice, k1, k2tog (15 sts).