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  1. or download this
    use Readonly PI => 3.141593;
    
  2. or download this
    Readonly version 3.14 required--this is only version 1.03 at C:/Perl/l
    +ib/Exporter/Heavy.pm line 121.
    BEGIN failed--compilation aborted at mytest.pl line 5.
    
  3. or download this
    use Readonly;
    
    Readonly my $PI => 3.141592654;
    
    print "$PI\n";