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How many possible codes can be created under a prefix?

This will vary depending on the format chosen.  The format options can be found here.  Assuming that a start code was not set and the prefix was starting from the very first code, following are the approximate calculations for each format.

4 digit code: approximately half a billion codes
1 digit year + 3 digit code: approximately 46 million (for each year digit)
3 digit code + 1 digit year: approximately 46 million (for each year digit)
Custom: this cannot be estimated due to the various ways this format can be used

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