Question: What is the Twitter username for the agent whose headquarter location is Arkansas?
Choices: AOL
Parlophone
hikkaripikkari
JudgeCarter
polimi
JOEtheMORTON
Walmart
ArlingtonNatl
HoustonRockets
mars
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "agent" . ?e <headquarters_location> ?e_1 . ?e_1 <pred:name> "Arkansas" .  ?e <Twitter_username> ?pv .  }
Program:
function: Find
inputs: Arkansas
function: Relate
dependencies: 0
inputs: headquarters location
backward
function: FilterConcept
dependencies: 1
inputs: agent
function: QueryAttr
dependencies: 2
inputs: Twitter username
Answer: Walmart