197.60/50.58	MAYBE
197.60/50.58	
197.60/50.58	Problem:
197.60/50.58	 b(a(b(b(x1)))) -> b(b(b(a(b(x1)))))
197.60/50.58	 b(a(a(b(b(x1))))) -> b(a(b(b(a(a(b(x1)))))))
197.60/50.58	 b(a(a(a(b(b(x1)))))) -> b(a(a(b(b(a(a(a(b(x1)))))))))
197.60/50.58	
197.60/50.58	Proof:
197.60/50.58	 Open
197.60/50.59	EOF