For the fun only
#include <Array.au3>
;Global $aArray[10] = ["a","a","b","c","c","d","e","c","e"]
Global $aArray[7] = ['script', 'autoit', 'autoit', 'script', 'script', 'forum', 'autoit']
_ArraySort($aArray)
$r = StringReplace(StringRegExpReplace(_ArrayToString($aArray), '^\||(\w+)\|(?:\1\|*)+', ""), "|", @crlf)
msgbox(0,"", $r)