2.1.1.1 Conventions for Program-Names
The program-name of a program is specified in the PROGRAM-ID paragraph of the program's Identification Division. A program-name can be referenced only by the CALL statement, the CANCEL statement, the SET statement, or the END PROGRAM header. Names of programs constituting a run unit are not necessarily unique, but when two programs in a run unit are identically named, at least one of the programs must be directly or indirectly contained within another separately compiled program that does not contain the other of those two programs.
A separately compiled program and all of its directly and indirectly contained programs must have unique program-names within that separately compiled program.
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