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$list1[0] += $list2[0];
$list1[1] += $list2[1];
$list1[2] += $list2[2];
$list1[3] += $list2[3];

for my $i (0..3) {
  $list1[$i] += $list2[$i];
}

$some_value += $array[0];
$some_other_value += $array[1];
$this_variable += $array[2];
$that_variable += $array[3];