PERFORM MODULE-NAME UNTIL condition.
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MODULE-NAME.
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ANOTHER-MODULE-NAME.
Execute all the instructions (statements, sentences) in MODULE-NAME. When the condition specified is met (true), the control returns to the statement directly following the PERFORM statement.
PERFORM UNTIL condition.
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END-PERFORM
Execute all the instructions (statements, sentences) within the PERFORM ... END-PERFORM loop. When the condition specified is met (true), the control returns to the statement directly following the END-PERFORM. statement.