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  Description : Returns the previous element as specified by the order defined by the tree.

  Returntype  : The item, if found, as stored in the tree or undef
                if the tree is empty.
  Exceptions  : None
  Caller      : General
  Status      : Unstable

=head1 DEPENDENCIES

AVLTree requires Carp and Test::More, Test::Deep and Test::LeakTrace to run the tests during installation.
If you want to run the benchmarks in the scripts directory, you need to install the Benchmark 
and List::Util modules.

=head1 EXPORT

None

=head1 SEE ALSO

If you want to get a deeper insight into the module, you should of course take a look at the excellent AVL