Shown with a cast-on count of 15 stitches.  

• Row 1 (RS): P2, *3-to-3 gather, p1, repeat from * to last st, p1.
• Row 2: P1, *k1, p3, repeat from * to last 2 sts, p2.
• Row 3: P2, k1, *yo, p3tog, yo, k1, repeat from * to last 4 sts, yo, p3tog, yo, p1.
• Row 4: P1, *k3, p1, repeat from * to last 2 sts, p2.
• Row 5: P1, *p1, 3-to-3 gather, repeat from * to last 2 sts, p2.
• Row 6: P2, *p3, k1, repeat from * to last st, p1.
• Row 7: P1, *p1, yo, p3tog, yo, repeat from * to last 2 sts, p2.
• Row 8: P2, *k3, p1, repeat from * to last st, p1.