Deduplication in Discovery Accelerator

Hi-

I am running Discovery Accelerator 9.0.  I am searching for 4 email addresses in the To/From fields.  The search is limited to a journal archive.  My question is, when the search results are presented, are they deduplicated automatically?  The search results returned 109,000 items.  Does Discovery Accelerator, behind the scenes, perform deduplcation during the search process?  I've read a ton of material, but its not clear to me whether deduplication is something that I have to elect to do, or if it is done by default.