human
Solve the following python programming problem given the following code:
@ property 
@ _memo 
def graph(self) : 
    'NetworkX undirected graph representing this Surface.
        ' 
    import networkx as nx 
    def iter_surfedges(tris) : 
        for (a, b, c) in tris : 
            (yield (a, b)) 
            (yield (b, c)) 
            (yield (a, c)) 
def make_surface_graph(tris) : 
        graph = nx.Graph () 
        graph.add_edges_from (iter_surfedges (tris)) 
        return graph 
return make_surface_graph (iter_surfedges.polys) 

    
    

    Fix the buggy line: return make_surface_graph (iter_surfedges.polys)
assistant
#Here is Python code to fix the buggy line: return make_surface_graph (iter_surfedges.

return make_surface_graph (self.polys)