Iterating over Arrays

What happen with my code?

use strict;
use warnings;
use diagnostics;

my @words = ("this","that");

# With this code
$words[5] = "bad idea";

for my $element (@words){
        print "$element\n";
}

~
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"words.pl" 13L, 167B                           1,1           All


Use of uninitialized value $element in concatenation (.) or string at
words.pl line 11.
 at words.pl line 11.

-- 

With kindest regards, William.

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