could be this? 
 perl -e '@a=qw/z a r a z a a x/; $regex="|";foreach(@a){$regex.=$_."|
+" unless /^"$regex"$/ && $regex}@a=split /\|/, $regex; print @a'

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In reply to Re: removing duplicates entries from an array by smokemachine
in thread removing duplicates entries from an array by JFarr

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