Shown with a cast-on count of 22 stitches.  

• Row 1 (RS): K2, *k2, [yo, k1] 5 times, yo, k2, repeat from * to last 2 sts, k2 (multiple of 15 sts, plus 4).
• Row 2: P2, *p2, k11, p2, repeat from * to last 2 sts, p2.
• Row 3: K2, *k2tog, k11, k2tog, repeat from * to last 2 sts, k2 (multiple of 13 sts, plus 4).
• Row 4: P2, *p2tog, p9, p2tog, repeat from * to last 2 sts, p2 (multiple of 11 sts, plus 4).
• Row 5: K2, *k2tog, k7, k2tog, repeat from * to last 2 sts, k2 (multiple of 9 sts, plus 4).