Shown with a cast-on count of 31 stitches.  

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