code: def _cut_hyperedges(hypergraph):
      
      edges_ = cut_nodes(hypergraph.graph)
      edges = []
      
      for each in edges_:
          if (each[1] == 'h'):
              edges.append(each[0])
      
      return edges
docs: Return the cut-hyperedges of the given hypergraph.
      
      @type  hypergraph: hypergraph
      @param hypergraph: Hypergraph
      
      @rtype:  list
      @return: List of cut-nodes.