def diamond_graph(create_using=None):
 description = ['adjacencylist', 'Diamond Graph', 4, [[2, 3], [1, 3, 4], [1, 2, 4], [2, 3]]]
 G = make_small_undirected_graph(description, create_using)
 return G

def diamond_graph ( create_using = None ) : description = [ 'adjacencylist' , 'Diamond Graph' , 4 , [ [ 2 , 3 ] , [ 1 , 3 , 4 ] , [ 1 , 2 , 4 ] , [ 2 , 3 ] ] ] G = make_small_undirected_graph ( description , create_using ) return G
return the diamond graph .