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- No compiler can provide operators to manipulate application-
- specific data structures. Programmers must write routines to
- model the attributes of the data. For modularity, programmers
- often make an interface of functions located in separate files or
- compilation units. Considerable skill and programmer discipline
- is necessary to ensure all transactions use the intended interface
- correctly, and even the best-designed schemes can fall apart
- during program maintenance.
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