Each invoice is numbered with client code and invoice number. So Acme client is assigned a client number of 101. Acme's tenth invoice will be numbered 101-10 and the next one will be 101-11, etc. Nothing particularly special. It works most of the time. But from time to time in the list of invoices, I will see an invoice referred to as, for example, G:101-10. The preceding one may have been C:101-9.
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