Letter Merge / Removing Duplicate Entries

[Ron]

How do I remove "duplicate" records prior to the merge
process?

For instance, record 1 Bill Smith / 120 Main Street
record 2 Jill Smith / 120 Main Street
record 3 Ron Jackson / 500 Elm Street

I would like only two labels:
(1) The Smith Family / 120 Main Street
(2) The Jackson Family / 500 Elm Street

How can I intercept the input merge file and remove
the duplicate (2nd) record? Is there an option within
the merge process?

My version of Word is Word 2000.

Thank You.