197.92/50.64	MAYBE
197.92/50.64	
197.92/50.64	Problem:
197.92/50.64	 a(a(a(b(x1)))) -> b(a(b(a(x1))))
197.92/50.64	 a(a(b(b(x1)))) -> a(a(a(b(x1))))
197.92/50.64	 a(a(a(b(x1)))) -> b(b(a(b(x1))))
197.92/50.64	 b(b(b(a(x1)))) -> b(a(b(b(x1))))
197.92/50.64	
197.92/50.64	Proof:
197.92/50.64	 Open
197.92/50.64	EOF