Shown with a cast-on count of 31 stitches.  

• Rows 1, 3, 5, 7, 9, 11, 13, 15, 17, and 19 (WS): Purl.
• Row 2: *K5, yo, ssk, k3, repeat from * to last st, k1.
• Rows 4, 8, 12, 16, and 20: Purl.
• Row 6: *K3, k2tog, yo, k1, yo, ssk, k2, repeat from * to last st, k1.
• Row 10: *K2, k2tog, yo, k3, yo, ssk, k1, repeat from * to last st, k1.
• Row 14: *K1, k2tog, yo, k5, yo, ssk, repeat from * to last st, k1.
• Row 18: K2tog, yo, k7, *yo, sl1-k2tog-psso, yo, k7, repeat from * to last 2 sts, yo, ssk.