MAYBE
42.37/12.46	MAYBE
42.37/12.46	
42.37/12.46	Problem:
42.37/12.46	 a(x1) -> x1
42.37/12.46	 a(b(b(x1))) -> b(b(b(c(x1))))
42.37/12.46	 c(b(x1)) -> a(a(x1))
42.37/12.46	
42.37/12.46	Proof:
42.37/12.46	 Open
42.37/12.46	EOF