Shown with a cast-on count of 31 stitches.  

• Row 1 (RS): K1, yo, ssk, *p1, [k2tog, yo, k1] twice, yo, ssk, k1, yo, ssk, repeat from * to last 4 sts, p1, k2tog, yo, k1.
• Rows 2, 4, 6, and 8: Purl.
• Row 3: P1, k1, *yo, sl1-k2tog-psso, yo, k1, k2tog, yo, k1, p1, k1, yo, ssk, k1, repeat from * to last 5 sts, yo, sl1-k2tog-psso, yo, k1, p1.
• Row 5: P1, k2tog, yo, *[k1, yo, ssk] twice, p1, k2tog, yo, k1, k2tog, yo, repeat from * to last 4 sts, k1, yo, ssk, p1.
• Row 7: K2tog, yo, k1, *p1, k1, yo, ssk, k1, yo, sl1-k2tog-psso, yo, k1, k2tog, yo, k1, repeat from * to last 4 sts, p1, k1, yo, ssk.