MAYBE
228.51/58.10	MAYBE
228.51/58.10	
228.51/58.10	Problem:
228.51/58.10	 b(a(b(b(x1)))) -> b(b(b(a(b(x1)))))
228.51/58.10	 b(a(a(b(b(x1))))) -> b(a(b(b(a(a(b(x1)))))))
228.51/58.10	 b(a(a(a(b(b(x1)))))) -> b(a(a(b(b(a(a(a(b(x1)))))))))
228.51/58.10	 b(a(a(a(a(b(b(x1))))))) -> b(a(a(a(b(b(a(a(a(a(b(x1)))))))))))
228.51/58.10	
228.51/58.10	Proof:
228.51/58.10	 Open
228.51/58.10	EOF