what conference series has a weekly frequency?
Entity
m.03233l
Seminar
class class entity
conferences.type_of_conference conferences.conference_series m.02k9zmh
conferences.type_of_conference conferences.conference_series measurement_unit.unit_of_frequency
Type of conference Conference series Weekly
none none none
conferences.type_of_conference.conferences_of_this_type time.recurring_event.current_frequency
Conferences of this type Current frequency
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :conferences.type_of_conference . 
?x1 :type.object.type :conferences.conference_series . 
VALUES ?x2 { :m.02k9zmh } 
?x0 :conferences.type_of_conference.conferences_of_this_type ?x1 . 
?x1 :time.recurring_event.current_frequency ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND conferences.type_of_conference (JOIN conferences.type_of_conference.conferences_of_this_type (JOIN time.recurring_event.current_frequency m.02k9zmh)))