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  1. or download this
    $ perl test.pl 1 2
    This Perl not built to support threads
    Compilation failed in require at test.pl line 3.
    BEGIN failed--compilation aborted at test.pl line 3.
    
  2. or download this
    #! /usr/bin/perl
    use forks;
    ...
    Argument "2.56_01" isn't numeric in numeric ge (>=) at /home/user/perl
    +5/lib/perl5/x86_64-linux/forks.pm line 1570.
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