Hi, Have a look at How can I display a unique array if it contains some repeated elements in Categorized Questions and Answers.

If you want to preserve the order of the first seen item

@values = qw(this is a test of the hello test of the test artist hello
+ world);
@unqiue_values =   grep { !$seen{$_}++   } @values;
print join " " => @unqiue_values,"\n";
__END__
this is a test of the hello artist world
[download]

artist