Distinct(Project(Filter((?cat = ?show) && (<http://www.w3.org/2001/XMLSchema#integer>(?precio) <= 250),
                        Join(Project(Union(BGP( ?show ?y <http://www.wawser.com/cat/2>),
                                           BGP( ?x ?y <http://www.wawser.com/cat/2> .
                                            ?show ?y ?x)),
                                     {?show}),
                             BGP( ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.semantic.wawser.com/eventos> .
                                  ?boletos <http://www.types.wawser.com/precio> ?precio .
                                  ?x <http://www.types.wawser.com/boletos> ?boletos .
                                  ?x <http://www.types.wawser.com/cat> ?cat .
                                  ?x <http://purl.org/dc/elements/1.1/title> ?titulo))),
                 {?titulo}))