parent $tree object $tree_2 var $root dbref 'tree_2 var $root child_index 0 var $root fertile 0 var $root manager $tree_2 var $root owned [$tree_2] var $root owners [$] var $root writable [] var $root readable ['parameters, 'methods, 'code] var $root inited 1 var $tree parents_by_tree #[] var $tree children_by_tree #[]