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extracting unique elements

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Is there any easy way to select only the unique elements from an xml document.
for example if i had the following xml document:

<SALESFORCE>
     <SALESPERSON NAME="BOB">
          <CUSTOMER CODE="1">ACME</CUSTOMER>
          <CUSTOMER CODE="2">BLAMMO</CUSTOMER>
     </SALESPERSON>
     <SALESPERSON NAME="TODD">
          <CUSTOMER CODE="1">ACME</CUSTOMER>
          <CUSTOMER CODE="3">KABLOOEY</CUSTOMER>
     </SALESPERSON>
     <SALESPERSON NAME="BETTY">
          <CUSTOMER CODE="4">JUICY JUICY</CUSTOMER>
          <CUSTOMER CODE="2">BLAMMO</CUSTOMER>
     </SALESPERSON>
</SALESFORCE>

I would want to only display:

ACME
BLAMMO
KABLOOEY
JUICY JUICY


thanks.



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