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Open Transaction File for reading
Open Old UserIDs File for reading
Open New UserIDs file for writing
While not end of Transaction file do
Read Next Transaction File Record
Read Next Old UserIDs File record
If Transaction File Record.UserID <> Old UserIDs File Record.UserID
Then Write Old UserIDs File Record to New UserIDs File
EndIf
EndWhile
Write remainder of Old UserIDs file to New UserIDs file
Close all files
Archive Old Users File //(If it asks you to)
Rename New UserIDs File as CurrentUserIDs File
Open File for writing
Append Record to end of file
Close file writing
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