IDENTIFICATION DIVISION.
PROGRAM-ID. SAMPLE.
ENVIRONMENT DIVISION.
DATA DIVISION.
WORKING-STORAGE SECTION.
77 n PIC Z9 .
PROCEDURE DIVISION.
ACCEPT n
PERFORM UNTIL n = 42
DISPLAY n
ACCEPT n
END-PERFORM
STOP RUN.
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prog.cbl: 16: error: syntax error, on or before '.'
prog.cbl: 16: error: unknown or wrong statement, on or before '.'