my @array_2 = (1,2,3,4,5,6,7,8,9,undef,undef,undef,undef,undef,undef);

##</code><code>##

my @array_2 = (1,2,3,4,5,6,7,8,9);
$array_2[14] = undef;

##</code><code>##

my %hash = (
    a => 1,
    b => 2,
);

##</code><code>##

Odd number of elements in hash assignment.
Use of uninitialized value in list assignment.