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use strict;
use warnings;
...
print '$node->taxon() = ', $node->taxon(), "\n";
print '$taxon->get_nodes() = ', $taxon->get_nodes(), "\n";

use strict;
use warnings;
...
$taxon->add_node($node);
print '$node->taxon() = ', $node->taxon(), "\n";
print '$taxon->get_nodes() = ', $taxon->get_nodes(), "\n";