Shown with a cast-on count of 21 stitches.  

• Rows 1, 3, 5, 7, 9, and 11 (WS): Purl.
• Row 2: K2, [yo, ssk] 3 times, yo, sl1-k2tog-psso, [yo, k2tog] 4 times, yo, k2.
• Row 4: K3, [yo, ssk] 3 times, yo, sl1-k2tog-psso, [yo, k2tog] 3 times, yo, k3.
• Row 6: K4, [yo, ssk] twice, yo, sl1-k2tog-psso, [yo, k2tog] 3 times, yo, k4.
• Row 8: K2, k2tog, yo, k1, [yo, ssk] twice, yo, sl1-k2tog-psso, [yo, k2tog] twice, yo, k1, yo, ssk, k2.
• Row 10: K1, k2tog, yo, k3, yo, ssk, yo, sl1-k2tog-psso, [yo, k2tog] twice, yo, k3, yo, ssk, k1.
• Row 12: K2tog, yo, k5, yo, ssk, yo, sl1-k2tog-psso, yo, k2tog, yo, k5, yo, ssk.