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> Every data structure inside the system is handled by reading and slicing around the contents of the text files.

This is quite common for mainframe systems, only because many mainframe applications are written in COBOL and that is the file format COBOL prefers.



Yes, you are right. I had not thought about that. Maybe the guy used to do mainframe programming. I've played with COBOL before, but the pattern never popped into mind.




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