Thread:Garr9988/@comment-24588058-20170513172249/@comment-24588058-20170514044551

The bottom row is where all the trouble lies. The left and center ones (PRH and LLAC) have, at least based on several cards with different codes on the past cards, can occasionally share the same two letters and the first four of seven numbers, though not always. And the last one, NNSP, has two to four letters.