* ==== TYPE: ADV-MATCH-PREVKEY-NO-MATCH ====
      * FEATURE: Has WS-PREV-KEY but NOT a matching program
      *          (trick the dedup/validation rule engine)
      * STATEMENT: IF
      * BRANCHES: 2, DECISIONS: 1
      * ADVERSARIAL: WS-PREV-KEY used only as counter, not matching
       IDENTIFICATION DIVISION.
       PROGRAM-ID. PREVKF.
       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01 WS-PREV-KEY PIC 9(5) VALUE 0.
       01 WS-VALUE    PIC 9(5) VALUE 0.
       PROCEDURE DIVISION.
       MAIN.
           ADD 1 TO WS-PREV-KEY.
           ADD WS-PREV-KEY TO WS-VALUE.
           IF WS-VALUE > 10
               DISPLAY 'BIG'
           ELSE
               DISPLAY 'SMALL'.
           STOP RUN.