Word Mail Merge Edit Recipient Question

I'm trying to create a merged document using Microsoft Access as my recipient database. My database has 2 fields from which I am filtering to create two individual mail merged letters. However, I wish to exclude any record from my merged file that is selected in BOTH fields. (I will be sending these records their own merged letter) I have no problem selecting the common records (those "checked" in both fields) to be printed, however, I wish to EXCLUDE these records from printing. (i.e. to not print these records) Can anyone give me advise on how to do this? (The 2 fields in my Access file are check boxes; True/False). Thanks in advance.