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  1. or download this
    #!/usr/bin/perl
use strict;
...
$ perl test.pl
sub a
sub b
  2. or download this
    #!/usr/bin/perl
use strict;
...
$ perl test.pl
sub a
sub b
  3. or download this
    #!/usr/bin/perl
use strict;
...

$ perl test.pl
sub a