def dummy_graph():
# A B
# B C
# A D
# D C
graph = Digraph()
graph.addArc("A", "B")
graph.addArc("B", "C")
graph.addArc("A", "D")
graph.addArc("D", "C")
return graph
def better_graph():
# A B
# B C
# C D
# B D
# D E
# E F
# E G
# G H
# G A
graph = Digraph()
graph.addArc("A", "B")
graph.addArc("B", "C")
graph.addArc("C", "D")
graph.addArc("B", "D")
graph.addArc("D", "E")
graph.addArc("E", "F")
graph.addArc("E", "G")
graph.addArc("G", "H")
graph.addArc("G", "A")
return graph
