Shown with a cast-on count of 24 stitches.  

• Rows 1, 3, 5, 7, 9, 11, 13, 15, 17, and 19 (WS): Purl.
• Rows 2 and 14: K4, *yo, ssk, k1, [k2tog, yo] twice, k3, repeat from *.
• Rows 4 and 12: *K3, [yo, ssk] twice, k1, k2tog, yo, repeat from * to last 4 sts, k4.
• Rows 6 and 10: K2, *[yo, ssk] 3 times, k4, repeat from * to last 2 sts, yo, ssk.
• Row 8: K1, *[yo, ssk] 4 times, k2, repeat from * to last 3 sts, yo, ssk, k1.
• Rows 16 and 20: K2tog, yo, *k4, [k2tog, yo] 3 times, repeat from * to last 2 sts, k2.
• Row 18: K1, k2tog, yo, *k2, [k2tog, yo] 4 times, repeat from * to last st, k1.