code: def build_franklin_graph():
      
      # The easiest way to build the Franklin graph is to start
      # with C12 and add the additional 6 edges
      graph = build_cycle_graph(12)
  
      edge_tpls = [
          (1,8),
          (2,7),
          (3,10),
          (4,9),
          (5,12),
          (6,11)
      ]
  
      for i, j in edge_tpls:
          graph.new_edge(i, j)
  
      return graph
docs: Makes a new Franklin graph.
         Ref: http://mathworld.wolfram.com/FranklinGraph.html