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#!/usr/bin/perl -wl 
use Data::Dumper;
...

__END__

$perl -w a 
   a.0=3&a.2=4 => {'a' => ['3',undef,'4']}
...
   a.a=3&a=b => CGI param clash for a value b at a line 27.
   a=3&a.0=b => CGI param clash for a.0=0 at a line 18.
   a=3&a.a=b => CGI param clash for a.a=a at a line 22.