The customer file is sorted alphanumerically, which means that the customer number 10AHOP would be placed ahead of AHOP10. Also, keep in mind that a 5-character customer number could be placed before a 3-character customer number.

 

This is a list of customer numbers, in the order they would be placed in the customer file: 10PPD  -  AP1  -  BFRB10  -  ZRB10  -  ZRB100