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COBOL, PROCEDURE_DIVISION, miscellaneous_topics, conditional_expressions, combined_and_negated_combined
 *Conan The Librarian 

  A combined condition results from connecting conditions with one of
  the logical operators AND or OR.

  Format -

   condition { { AND } condition } ...
             { { OR  }           }

  condition
    can be
      1)  A simple condition
      2)  A negated simple condition
      3)  A combined condition
      4)  A negated combined condition
      5)  Valid combinations of the preceding conditions
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