Vehicle registration plates of Chile
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Chile requires its residents to register their motor vehicles and display vehicle registration plates called "patentes". Formerly, it consisted of two letters followed by four numbers in the format AB-12-34, but combinations were exhausted in September 2007. The system adopted to replace the old one consists of four letters followed by two numbers in the format AB-CD-12. Vowels are not used in order to prevent profanity, and the letter Q is not used because of confusion with the number 0.