For around a decade Arizona had license plates in the format AAA0000 that were being distributed in order, but some time before they finished the ones starting

For around a decade Arizona had license plates in the format AAA0000 that were being distributed in order, but some time before they finished the ones starting with C they switched to another system. That system had 7 alphanumeric characters in an apparently scrambled order but with an unusual high number of repeated characters. Now they've changed again to 6 scrambled alphanumerics.