Question: When did the agent that includes the Royal Canadian Air Force as a part gain the short name CAF?
Choices: 2006-10-11
2009-01-01
2009
1995-04-20
1942-09-27
1975-12-04
1974-12-08
2009-09-17
1506-01-01
1937-01-01
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "agent" . ?e <has_part> ?e_1 . ?e_1 <pred:name> "Royal Canadian Air Force" .  ?e <short_name> ?pv . ?pv <pred:value> "CAF" . [ <pred:fact_h> ?e ; <pred:fact_r> <short_name> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Royal Canadian Air Force
function: Relate
dependencies: 0
inputs: has part
backward
function: FilterConcept
dependencies: 1
inputs: agent
function: QueryAttrQualifier
dependencies: 2
inputs: short name
CAF
start time
Answer: 2009