[CQ-Contest] Sweepstakes Scoring Rules for Dupes?

[Bill N6MW]

The question is how are dupes in the SS treated in log checking. Aside 
from the conventional wisdom of not removing your dupes since there is 
no penalty, there remains some mystery. Assume have a dupe with a 
station but one of the exchanges was not correctly copied by you - 
either the first or second. If the first is incorrect is that counted 
giving a penalty and the second ignored? Or the other way around? Or if 
either is correct is the other ignored and no penalty?

This question has been posed to the ARRl contest manager in several 
forms in emails but no firm answer has been provided. Follow up 
questions are no longer responded to.

Does anyone know, with certainty, the answer? Perhaps a member of the 
log checking crew knows?  N6MW