Custom report with large number of groups

I have a large number of groups (around 75).  I'm trying to create a report that will return any user in the domain who is a member of any group in the list.  Due to the number of groups I'm importing a text file into the search.  My problem is I don't want the group membership of every group, I understand how to do this.  I just want if a user is a member of any of these groups return the name just once.  Maybe this isn't possible using an imported text file, I'm trying to avoid creating 75 "Or"s in the search.  Thank you!

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