Shown with a cast-on count of 10 stitches.  

• Row 1 (WS): Sl1 wyif, *k1, p1, repeat from * to last st, p1.
• Row 2: Sl1 wyif, *k1, yo, repeat from * to last st, p1 (multiple of 2 sts, plus 2).
• Row 3: Sl1 wyib, *yo, sl1 wyib, k1, repeat from * to last st, p1 (multiple of 3 sts, plus 2).
• Row 4: Sl1 wyif, *k1, p3tog, repeat from * to last st, p1 (multiple of 2 sts, plus 2).