SELECT DISTINCT(t1.oferta_id) FROM ofertas as t1, ofertas_restricciones as t2 WHERE t1.interna = 0 AND t1.oferta_id = t2.oferta_id AND t1.alojamiento_id = '6527' AND t2.f_fin>='2018-12-12' AND t2.f_inicio <= '2019-04-12' AND t1.tipo_oferta_id <> '7' ORDER BY t1.prioridad