as a newcomer to the Perl way of handling multi-dimensional arrays, hashes of arrays, etc., i found these very useful, esp. perlreftut:
perlref - http://www.perldoc.com/perl5.6.1/pod/perlref.html
perlreftut - http://www.perldoc.com/perl5.6.1/pod/perlreftut.html
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