MAYBE
132.10/55.51	MAYBE
132.10/55.52	
132.10/55.52	Problem:
132.10/55.52	 b(b(a(b(x1)))) -> b(a(b(b(b(b(x1))))))
132.10/55.52	 b(a(b(b(x1)))) -> b(b(b(x1)))
132.10/55.52	 b(b(b(x1))) -> b(b(a(a(b(a(b(x1)))))))
132.10/55.52	
132.10/55.52	Proof:
132.10/55.52	 Open
132.10/55.52	EOF