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COBOL, ENVIRONMENT_DIVISION, FILE-CONTROL, clauses, BLOCK_CONTAINS
 *Conan The Librarian 

  The BLOCK CONTAINS clause specifies the size of a physical record.

  Format -

   BLOCK CONTAINS [smallest-block TO] blocksize { RECORDS    }
                                                { CHARACTERS }

  1 - smallest-block 

  is an integer literal.  It specifies the minimum physical record
  size.

  2 - blocksize 

  is an integer literal.  It specifies the exact or maximum physical
  record size.
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