Shown with a cast-on count of 19 stitches.  

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