Algo(T,k1,k2)
if(t!=NIL)then
	if(t->sx!=NIL || t->dx!=NIL)then
		visita(t->sx,k1,k2)
		visita(t->dx,k1,k2)
	else
		if(t->key > k1 && t->key < k2 && t->Key%2=0)then
			cancella_elemento
		else
			(?)