200.44/50.18	MAYBE
200.44/50.18	
200.44/50.18	Problem:
200.44/50.18	 a(b(x1)) -> x1
200.44/50.18	 a(b(x1)) -> b(c(x1))
200.44/50.18	 a(c(x1)) -> b(a(a(a(x1))))
200.44/50.18	
200.44/50.18	Proof:
200.44/50.18	 Open
200.44/50.19	EOF