197.77/50.60	MAYBE
197.77/50.60	
197.77/50.60	Problem:
197.77/50.60	 b(a(a(b(x1)))) -> a(b(a(b(x1))))
197.77/50.60	 a(a(a(a(x1)))) -> b(b(b(b(x1))))
197.77/50.60	 b(b(a(b(x1)))) -> b(b(a(a(x1))))
197.77/50.60	
197.77/50.60	Proof:
197.77/50.60	 Open
197.77/50.60	EOF