 When "W 9999 Y" was achieved, the second alphabetical sequence emerged between the state prefix and number sequence, leading to "WA 1 A".When "WA 9999 Y" is met, the first alphabetical sequence will reset and the second alphabetical sequence will advance, giving "WB 1 A".When "WY 9999 Y" is reached, a third new alphabetical sequence will be spliced into the algorithm, between the second alphabetical sequence and number sequence, resulting in "WAA 1 A".