digraph test {
	rankdir=LR
	node [shape=circle]
	root [label="", shape=point]
	root -> r [label=""]
	root -> f [label=""]
	r [label=""]
	r -> rr [label=""]
	rr [label=""]
	rr -> rrr [label=""]
	rrr [label=""]
	rrr -> rrrr [label=""]
	rrrr [label=""]
	rr -> rrf [label=""]
	rrf [label=""]
	rrf -> rrfr [label=""]
	rrfr [label=""]
	rrf -> rrff [label=""]
	rrff [label=""]
	rrr -> rrrf [label=""]
	rrrf [label=""]
	r -> rf [label=""]
	rf [label=""]
	rf -> rfr [label=""]
	rfr [label=""]
	rfr -> rfrr [label=""]
	rfrr [label=""]
	rfr -> rfrf [label=""]
	rfrf [label=""]
	rf -> rff [label=""]
	rff [label=""]
	rff -> rffr [label=""]
	rffr [label=""]
	rff -> rfff [label=""]
	rfff [label=""]
	f [label=""]
	f -> fr [label=""]
	fr [label=""]
	fr -> frr [label=""]
	frr [label=""]
	frr -> frrr [label=""]
	frrr [label=""]
	frr -> frrf [label=""]
	frrf [label=""]
	fr -> frf [label=""]
	frf [label=""]
	frf -> frfr [label=""]
	frfr [label=""]
	frf -> frff [label=""]
	frff [label=""]
	f -> ff [label=""]
	ff [label=""]
	ff -> ffr [label=""]
	ffr [label=""]
	ffr -> ffrr [label=""]
	ffrr [label=""]
	ffr -> ffrf [label=""]
	ffrf [label=""]
	ff -> fff [label=""]
	fff [label=""]
	fff -> fffr [label=""]
	fffr [label=""]
	fff -> ffff [label=""]
	ffff [label=""]
}