open(FILESOURCE, "sample.txt") or die("Unable to open requested file.");
my $document = <FILESOURCE>;
close (FILESOURCE);

open(TEST, "results_stopwords.txt") or die("Unable to open requested file.");

use Lingua::StopWords qw( getStopWords );
my $stopwords = getStopWords('en');

print join ' ', grep { !$stopwords->{$_} } $document;