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  1. or download this
    use strict;
use warnings;
...

__XX__
int xyz(){ printf("hhaahah\n"); return 1; }
  2. or download this
    Undefined subroutine &main::xyz called at a.pl line 8.
  3. or download this
    use strict;
use warnings;
...
int xyz(){ printf("hhaahah\n"); return 1; }
EOC
xyz();