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COBOL, PROCEDURE_DIVISION, miscellaneous_topics, reference_modification
 *Conan The Librarian 

  Reference modification defines a subset of a data item by specifying
  its leftmost character and length.

  Format 1 -

   data-name ( leftmost-character-position : [ length ] )

  Format 2 -

   FUNCTION function-name [ ({argument}...) ]

      ( leftmost-character-position : [ length ] )
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