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  1. or download this
    use strict;
    use warnings;
    ...
            print "LIGHTS ON\n";
        }
    }
    
  2. or download this
    $ perl t.pl
    Range: 450
    ...
    Range: 450
    LIGHTS ON
    Range: 350
    
  3. or download this
    #!/usr/bin/env perl
    use strict;
    ...
    100 350  In range A
    200 500  In range B
    300 400  In range C
    
  4. or download this
    $ perl t.pl
    Range: 0
    ...
    Range: 530
    Range: 550
    Range: 557