Literal question
    
                                    512. DETERMINE MONTHS MARRIED SINCE JUNE 1998. ENTER "X" IN COLUMN 4 OF CALENDAR FOR EACH MONTH MARRIED AND ENTER "0" FOR EACH MONTHS NOT MARRIED, SINCE JUNE 1998.
FOR WOMEN WITH MORE THAN ONCE MARRIAGE: PROBE FOR STARTING AND TERMINATION DATES OF ANY PERVIOUS UNIONS.
FOR WOMEN NOT CURRENTLY MARRIED: PROBE FOR DATE WHEN LAST MARRIAGE STARTED AND FOR TERMINATION DATE, AND IF APPROPRIATE, FOR THE STARTING AND TERMINATION DATES OF ANY PERVIOUS MARRIAGES.