http://www.bennadel.com/blog/432-Using-ColdFusion-Structures-To-Remove-Duplicate-List-Values.htm
* <!--- Create a structure to hold the movie titles. --->
* <cfset objMovies = StructNew() />
*
* <!--- Loop over the list to add mappings to the struct. --->
* <cfloop index="strMovie" list="#lstMovies#" delimiters=",">
*
* <!---
* Store key/value pair. In this case, we don't
* really care about the value (hence storing ""
* as value). We only care about the key.
* --->
* <cfset objMovies[ strMovie ] = "" />
*
* </cfloop>
*
* <!--- Convert the now unique key values into a list. --->
* <cfset lstMovies = StructKeyList( objMovies ) />
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