Shown with a cast-on count of 23 stitches.  

• Rows 1, 3, 5, 7, 9, 11, 13, 15, 17, and 19 (WS): Purl.
• Rows 2 and 18: K1, *k2tog, k4, [yo, k1] twice, ssk, k1, repeat from *.
• Rows 4 and 16: K1, *k2tog, k3, yo, k1, yo, k2, ssk, k1, repeat from *.
• Rows 6 and 14: K1, *k2tog, k2, yo, k1, yo, k3, ssk, k1, repeat from *.
• Rows 8 and 12: K1, *k2tog, [k1, yo] twice, k4, ssk, k1, repeat from *.
• Row 10: K1, *k2tog, yo, k1, yo, k5, ssk, k1, repeat from *.
• Row 20: K1, *k2tog, k5, yo, k1, yo, ssk, k1, repeat from *.