 Once "P 9999" was achieved, an alphabetical sequence was added to the right of the state prefix; "PA 1" was the result.When "PA 9999" was reached, the number sequence was reset and the alphabetical sequence progressed; "PB 1" being the outcome.After "PY 9999" was achieved, a second alphabetical sequence was added to the right of the first alphabetical sequence; "PAA 1" being the outcome.