208.20/50.47	MAYBE
208.20/50.47	
208.20/50.47	Problem:
208.20/50.47	 a(x1) -> b(x1)
208.20/50.47	 a(a(b(c(x1)))) -> b(c(c(a(a(a(x1))))))
208.20/50.47	
208.20/50.47	Proof:
208.20/50.47	 Open
208.20/50.47	EOF