code: def wrfdist_task(newick_string_a, newick_string_b, normalise, min_overlap=4, overlap_fail_value=0):
      
      tree_a = Tree(newick_string_a)
      tree_b = Tree(newick_string_b)
      return treedist.wrfdist(tree_a, tree_b, normalise, min_overlap, overlap_fail_value)
docs: Distributed version of tree_distance.rfdist
      Parameters: two valid newick strings and a boolean