MAYBE
222.68/56.43	MAYBE
222.68/56.43	
222.68/56.43	Problem:
222.68/56.43	 b(a(b(b(x1)))) -> b(b(b(a(b(x1)))))
222.68/56.43	 b(a(a(b(b(x1))))) -> b(a(b(b(a(a(b(x1)))))))
222.68/56.43	 b(a(a(a(b(b(x1)))))) -> b(a(a(b(b(a(a(a(b(x1)))))))))
222.68/56.43	
222.68/56.43	Proof:
222.68/56.43	 Open
222.68/56.46	EOF