Shown with a cast-on count of 23 stitches.  

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