def petersen_graph(create_using=None):
 description = ['adjacencylist', 'Petersen Graph', 10, [[2, 5, 6], [1, 3, 7], [2, 4, 8], [3, 5, 9], [4, 1, 10], [1, 8, 9], [2, 9, 10], [3, 6, 10], [4, 6, 7], [5, 7, 8]]]
 G = make_small_undirected_graph(description, create_using)
 return G

def petersen_graph ( create_using = None ) : description = [ 'adjacencylist' , 'Petersen Graph' , 10 , [ [ 2 , 5 , 6 ] , [ 1 , 3 , 7 ] , [ 2 , 4 , 8 ] , [ 3 , 5 , 9 ] , [ 4 , 1 , 10 ] , [ 1 , 8 , 9 ] , [ 2 , 9 , 10 ] , [ 3 , 6 , 10 ] , [ 4 , 6 , 7 ] , [ 5 , 7 , 8 ] ] ] G = make_small_undirected_graph ( description , create_using ) return G
return the petersen graph .