MAYBE
34.48/10.31	MAYBE
34.48/10.31	
34.48/10.31	Problem:
34.48/10.31	 a(x1) -> x1
34.48/10.31	 a(a(x1)) -> a(b(a(b(x1))))
34.48/10.31	 b(b(b(b(x1)))) -> a(x1)
34.48/10.31	
34.48/10.31	Proof:
34.48/10.31	 Open
34.48/10.31	EOF