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  1. or download this
    my @nums = (-2 .. 2);
for my $num (@nums) {
    printf "!!%2d => %d\n", $num, !!$num;
}
  2. or download this
    !!-2 => 1
!!-1 => 1
!! 0 => 0
!! 1 => 1
!! 2 => 1