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  1. or download this
    use constant FALSE => 0;
use constant TRUE => !FALSE;
  2. or download this
    my $debug = FALSE; # or 0
$debug ^= 1; # now it's TRUE, or 1
$debug ^= 1; # now it's FALSE, or 0
  3. or download this
    $debug = !$debug; # change 1 to 0 or 0 to 1