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# Function to add a list of numbers together
sub sum {
...
    }
    return $sum;
}

use List::Util 'reduce';
sub sum {
    my @numbers = @_;
    return reduce { $a + $b } @numbers;
}

sub sum {
    my $sum;
    $sum += $_ for @_;
    return $sum;
}

use List::Util 'sum';