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  1. or download this
    if ($foo[100000] == 1) {
    ...
}
  2. or download this
    [
    undef,
...
    undef,
    [ undef, undef, undef, undef , undef ],
]
  3. or download this
    $matrix[4][4] = undef
  4. or download this
    [
    undef,
...
    undef,
    [ undef, undef, undef, undef , undef ],
]