Question: What is the Twitter username of the American football team headquartered in Baltimore?
Choices: TayeDiggs
realjoancusack
Rayados
OL
journeyofficial
Ravens
ABSCBN
JoniMitchellcom
RealNoth
chicagotheband
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "American football team" . ?e <headquarters_location> ?e_1 . ?e_1 <pred:name> "Baltimore" .  ?e <Twitter_username> ?pv .  }
Program:
function: Find
inputs: Baltimore
function: Relate
dependencies: 0
inputs: headquarters location
backward
function: FilterConcept
dependencies: 1
inputs: American football team
function: QueryAttr
dependencies: 2
inputs: Twitter username
Answer: Ravens