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Ledger Flashing Under Door

Any ideas how to flash a ledger board under the door when there's no existing pan flashing under the threshold?  Basically the threshold rests on the sub-floor, then double rim joist.  Threshold overhangs into the outside about 2".  Do I try to jam Z-flashing between sub-floor and threshold?  Then how do I transition flashing to area that's not under door?  Thanks!  

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