Handling Duplicate Lines in XSL

I have an XML file with multiple rows which are the same:

Cust1 443 West
Cust1 443 West
Cust1 443 West

Is there any way to suppress the second or third row if it is the same as the 
previous one?

At first I tried using variables, but then I found that you can't change 
variable values.

<xsl:variable name="newcust" select="CUST"/>
<xsl:variable name="cust"/>
<xsl:if test="$cust!=$newcust">

Is there another way?

Thanks,

Jens

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