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  1. or download this
    #!/usr/bin/perl
    
    ...
    ERROR in Tk::Graph:Tk::Graph::set #947: Option '-type' is incorrect! (
    +) at /usr/lib/perl5/site_perl/5.8.0/Tk/Graph.pm line 1802.
    Can't set -variable to `undef' for Tk::Graph=HASH(0x84c9780): Tie::Wat
    +ch::new(): -variable is required. at /usr/lib/perl5/site_perl/5.8.0/T
    +k/Graph.pm line 1088
     at /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi/Tk/Derived.
    +pm line 294
    
  2. or download this
    use strict;
    use warnings;
    
  3. or download this
    #!/usr/bin/perl
    
    ...
    
    # Main program
    reportg();