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  Verb:         PERFORM
 
  Function:     Causes a group of statements to be executed repeatedly.
                If the statements are a procedure, this statement
                repeatedly transfers control to that procedure, with
                automatic return of control each time the procedure
                finishes.
 
  Syntax:       Which format?  ◄Simple►   TIMES
                               ◄UNTIL►   ◄VARYING►
 
  ►►──PERFORM─┬─procedure-name-1─┬─────────────────────────────┬─phrase─┬─►◄
              │                  └┬─THROUGH─┬─procedure-name-2─┘        │
              │                   └─THRU────┘                           │
              └─phrase──imperative-statement END-PERFORM────────────────┘
 
  where phrase is:
 
   ►──┬─identifier-1─┬─TIMES───────────────────────►
      └─integer-1────┘
                                    -♦-