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#!/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

use strict;
use warnings;

#!/usr/bin/perl

...

# Main program
reportg();