The creator of Arizona's new license plate numbering system must have either been high as fuck or extremely autistic. These plate numbers are shuffled like a deck of cards (see pic related. For example, plate number 1LA 4PB unscrambles into AB1PL4). The rules are as follows:

>Each digit (except 4) starts at A and progresses upwards to Z, then 0-9 in the same position
>Letters I, O, Q, and U are skipped
>Digit 1: 3rd MSD, Can be any letter or number. Moves about once every 2 days.
>Digit 2: 5th MSD. Can be any letter or number
>Digit 3: 1st MSD. Can only be A, at least for the next 5 years, until it rolls over to B
>Digit 4: Least significant digit. Can be any number 0-9
>Digit 5: 4th MSD. Can be any letter or number
>Digit 6: 2nd MSD. Can be any letter (A-E Observed, about to roll into F in the coming weeks). Moves about once every two months
>AAA 0AA -> AAA 9AA (AAA AA9)
>ABA 0AA -> AZA 9AA (AAA AZ9)
>A0A 0AA -> A9A 9AA (AAA A99)
>AAA 0BA -> A9A 99A (AAA 999)
>B0A 0AA -> 99A 99A (AA9 999)
>AAA 0AB -> etc
>Current observed high: 3#A #PE

This produces 8 unique "formats" of letters and numbers (see pic related). Plates of this series can have either 1, 2, 3 or 4 numbers, and 5, 4, 3, or 2 letters respectively. The most common format is four letters and two numbers, making up 44.3% of all plates in a block (one flip of digit 6, AAA0AA -> AAA0AB, 327,680 plates). This is followed by the five letter one number (32.5%), three letter three number (20.1%), with four numbers and two letters being the rarest format (3%).

This can be further broken down by individual configuration. I don't feel like explaining all 8, so just refer to pic related. It's also easier to read a table than a paragraph regurgitating that same table.