[RTTY] Submitting JARTS log - need info on "dupe check file"?

[jflanders2@home.com (Jerry Flanders)]

JARTS rules say:

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

I don't see anything in my Writelog files that gives me a dupe check file 
this directly. How did you guys do this?

Thanks

Jerry W4UK