Question: When did the TV series which features Sigourney Weaver in the cast end?
Choices: 1990-02-19
1902-05-31
1886
1944-11-22
1701
2004-01-01
1961-05-31
2008-11-25
1945-04-11
1976-12-31
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "television series" . ?e <cast_member> ?e_1 . ?e_1 <pred:name> "Sigourney Weaver" .  ?e <end_time> ?pv .  }
Program:
function: Find
inputs: Sigourney Weaver
function: Relate
dependencies: 0
inputs: cast member
backward
function: FilterConcept
dependencies: 1
inputs: television series
function: QueryAttr
dependencies: 2
inputs: end time
Answer: 1976-12-31