Edge: list(str(hey)) -> var(names) # names
Edge: str(hello) -> list(str(hello), str(world)) # 0
Edge: str(hey) -> list(str(hey)) # 0
Edge: str(world) -> list(str(hello), str(world)) # 1
Vertex: list()
Vertex: list(str(hello), str(world))
Vertex: list(str(hey))
Vertex: str(hello)
Vertex: str(hey)
Vertex: str(name)
Vertex: str(world)
Vertex: var(names)