Shown with a cast-on count of 21 stitches.  

• Rows 1, 7, 9, and 15 (RS): P3, *k6, p3, repeat from *.
• Rows 2, 8, 10, and 16: *K3, p6, repeat from * to last 3 sts, k3.
• Row 3: P3, *k3, k2tog, yo, k1, yo, p3, repeat from * (multiple of 10 sts, plus 3).
• Row 4: *K3, p3, p2tog, p2, repeat from * to last 3 sts, k3 (multiple of 9 sts, plus 3).
• Row 5: P3, *k1, k2tog, k1, yo, k1, yo, k1, p3, repeat from * (multiple of 10 sts, plus 3).
• Row 6: *K3, p5, p2tog, repeat from * to last 3 sts, k3 (multiple of 9 sts, plus 3).
• Row 11: P3, *yo, k1, yo, ssk, k3, p3, repeat from * (multiple of 10 sts, plus 3).
• Row 12: *K3, p2, ssp, p3, repeat from * to last 3 sts, k3 (multiple of 9 sts, plus 3).
• Row 13: P3, *k1, yo, k1, yo, k1, ssk, k1, p3, repeat from * (multiple of 10 sts, plus 3).
• Row 14: *K3, ssp, p5, repeat from * to last 3 sts, k3 (multiple of 9 sts, plus 3).