Shown with a cast-on count of 13 stitches.  

• Rows 1, 3, 9, 11, 17, and 19 (RS): P1, *k3, p1, repeat from *.
• Rows 2, 10, and 18: K1, *p3, k1, repeat from *.
• Rows 4, 12, and 20: K1, *yo, p3tog, yo, k1, repeat from *.
• Rows 5, 7, 13, 15, 21, and 23: K2, p1, *k3, p1, repeat from * to last 2 sts, k2.
• Rows 6, 14, and 22: P2, k1, *p3, k1, repeat from * to last 2 sts, p2.
• Row 8: P2tog, yo, k1, yo, *p1, yo, k1, yo, repeat from * to last 2 sts, p2tog (multiple of 4 sts, plus 5).
• Row 16: P2tog, yo, k1, yo, *p3tog, yo, k1, yo, repeat from * to last 2 sts, p2tog.