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SELECT e.id, e.titulo, e.subtitulo, e.thumbs, e.video, e.prezi, e.url FROM entradas e, categorias c, categorias_entradas ce, alumnos a, entradas_alumnos ea WHERE e.publicado = 1 and e.id = ce.entrada_id and ce.categoria_id = c.id and c.id = 5 and a.id = ea.alumno_id and ea.entrada_id = e.id and ea.alumno_id =