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  Verb:         MERGE
 
  Function:     Combines two or more identically sequenced files on a
                set of specified keys, and passes the records, in
                merge order, to an output procedure or output file.
 
  Syntax:
                        ┌────────────────────────────────────┐
                        │                         ┌──────────┐
                        ▼                         ▼          │
  ►►──MERGE file-name-1─┬──┬─┬─ASCENDING──┬─┬───┬─data-name-1─────►
                        └ON┘ └─DESCENDING─┘ └KEY┘
 
  ►─┬──────────────────────────────────────────┬─►
    └┬─────────┬─SEQUENCE─┬──┬─alphabet-name-1─┘
     └COLLATING┘          └IS┘
 
                       ┌──────────┐
                       ▼          │
  ►──USING file-name-2 file-name-3──►
 
  ►┬─OUTPUT PROCEDURE─┬──┬─procedure-name-1─┬───────────────────────────┬┬►◄
   │                  └IS┘                  └┬─THROUGH┬─procedure-name-2┘│
   │        ┌──────────┐                     └─THRU───┘                  │
   │        ▼          │                                                 │
   └─GIVING file-name-4──────────────────────────────────────────────────┘
                                    -♦-