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  1. or download this
    #!/usr/bin/perl
use strict;
...
 
$_ = "dlrow ,ruoF";
print scalar reverse;                  # Four, world
  2. or download this
    One, world
Two, world
Four, world
  3. or download this
    #!/usr/bin/perl
use strict;
...
 
$_ = "dlrow ,ruoF";
print scalar reverse $_;                  # Four, world
  4. or download this
    One, world
Two, world
dlrow, eerhTFour, world