Print on 4x6 index cards. There are 16 cards in each set. This works best with 3-4 students per group. Make as many sets as necessary; it is easier to change card color or ink color to help keep sets separate. Students must arrange the cards in a 4 by 4 pattern; like dominoes, but all touching sides must match. When done properly, the center letters read: PCOM / POSE / IMPA / RFAI.