Question: What is the start date that 4521 is the exploitation visa number of the visual artwork whose producer is Orson Welles?
Choices: 1946-06-25
1979-01-29
1582-11-28
1777-07-30
2012-10-10
1981-01-01
2013-04-03
2016-07-08
2007-07-24
1940-08-06
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "visual artwork" . ?e <producer> ?e_1 . ?e_1 <pred:name> "Orson Welles" .  ?e <exploitation_visa_number> ?pv . ?pv <pred:value> "4521" . [ <pred:fact_h> ?e ; <pred:fact_r> <exploitation_visa_number> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Orson Welles
function: Relate
dependencies: 0
inputs: producer
backward
function: FilterConcept
dependencies: 1
inputs: visual artwork
function: QueryAttrQualifier
dependencies: 2
inputs: exploitation visa number
4521
start time
Answer: 1946-06-25