198.05/50.69	MAYBE
198.05/50.69	
198.05/50.69	Problem:
198.05/50.69	 b(b(b(b(x1)))) -> a(b(b(a(x1))))
198.05/50.69	 a(a(b(a(x1)))) -> b(b(a(b(x1))))
198.05/50.69	 b(a(a(a(x1)))) -> b(b(b(b(x1))))
198.05/50.69	
198.05/50.69	Proof:
198.05/50.69	 Open
198.05/50.69	EOF