Shown with a cast-on count of 21 stitches.  

• Rows 1, 3, and 5 (WS): P3, *k3, p3, repeat from *.
• Row 2: K3, *p2tog, yo, p1, k3, repeat from *.
• Row 4: K3, *p1, yo, p2tog, k3, repeat from *.
• Row 6: K1, k2tog, *[p1, yo] twice, p1, sl1-k2tog-psso, repeat from * to last 6 sts, [p1, yo] twice, p1, ssk, k1.
• Rows 7, 9, and 11: K3, *p3, k3, repeat from *.
• Row 8: P1, yo, p2tog, *k3, p1, yo, p2tog, repeat from *.
• Row 10: P2tog, yo, p1, *k3, p2tog, yo, p1, repeat from *.
• Row 12: P2, yo, p1, *sl1-k2tog-psso, [p1, yo] twice, p1, repeat from * to last 6 sts, sl1-k2tog-psso, p1, yo, p2.