MAYBE
38.55/10.30	MAYBE
38.55/10.30	
38.55/10.30	Problem:
38.55/10.30	 a(x1) -> b(x1)
38.55/10.30	 a(x1) -> c(x1)
38.55/10.30	 a(b(x1)) -> b(a(c(x1)))
38.55/10.30	 c(c(x1)) -> a(x1)
38.55/10.30	
38.55/10.30	Proof:
38.55/10.30	 Open
38.55/10.31	EOF