I never understood why we added another number to the end of the plate. With the 6 digit plates (ABC 123) there are 17 million combinations. We ended up adding a number (ABC 1234) bringing that total to 170 million. But if we had added another letter to the front instead (ABCD 123) we get 457 million. Or best yet keep it 6 and allow letters or numbers for all 6 spots we get 2.2 billion combinations. problem solved forever, not just the next 15 years.
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