I have data with above columns where per reference I have multiple extension start dates and extension end dates in most case new extension start date doesn't start before pervious extension end date but in some instance new extension start date start before the previous extension end date I am trying to find total numbers of days per extension but I need to ensure if new extension starts before previous extension end date , then it should take difference of last extension end date and new extension end date I am not sure how to do this in SAS ,is any one able to help ?
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