Shown with a cast-on count of 23 stitches.  

• Row 1 (RS): *K2, yo, sl1-k2tog-psso, yo, k2, yo, k3tog, yo, k1, repeat from * to last st, k1.
• Rows 2, 6, and 8: Purl.
• Row 3: *K1, yo, ssk, yo, sl1-k2tog-psso, yo, k3tog, yo, k2tog, yo, repeat from * to last st, k1 (multiple of 10 sts, plus 1).
• Row 4: *P5, kfb, p4, repeat from * to last st, p1 (multiple of 11 sts, plus 1).
• Row 5: *[K1, yo, ssk] twice, k2tog, yo, k1, k2tog, yo, repeat from * to last st, k1.
• Row 7: *K4, yo, ssk, k2tog, yo, k3, repeat from * to last st, k1.