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PERFORM (↑ Statements)
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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─┬─────────────────────────────┬─┬─
              │                  └┬─THROUGH─┬─procedure-name-2─┘ │
              │                   └─THRU────┘                    │
              └─imperative-statement END-PERFORM─────────────────┘
                                    -♦-