[WriteLog] Dupes file for JARTS log submission?

[Jerry Flanders]

JARTS rules say:

"Any entry making more than 200 QSOs must submit duplicate check file."

How are you guys doing this? Until recently, I didn't work dupes, but now 
that my  setup allows it, I had a couple dozen out of my 699 QSOs in JARTS 
contest. (Obviously, not everyone is using WL...).

I haven't looked at the log in detail yet - I presume the dupes are already 
marked with "D" in the log, as they were marked that way in WL's display. 
Do I just isolate these in a separate file, just as I segregate the bands?

Jerry W4UK