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package tree;
      has '_branches' => (
...
  #return altered or coerced hash
  return $hash;
}

LinkedList{}
LinkedList.append()
...
LinkedList.has_children()
LinkedList.remove()
LinkedList.split()

package Bucket;
      has '_linkedlist' => (
...
                  _has_sublinks => 'has_children', 
               }
       };