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

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

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

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