Question: What is the official website of the American football team headquartered in Baltimore?
Choices: http://www.steelgetsreal.com
http://www.dothan.org/
http://www.sitesakamoto.com/
http://www.baltimoreravens.com
https://www.alecbaldwin.com/
http://www.ascolicalcio1898.it
http://www.patrickstewart.org/
http://windows.microsoft.com/ru-RU/windows7/products/home
http://www.motorola.com
https://www.arnhem.nl/
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 <official_website> ?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: official website
Answer: http://www.baltimoreravens.com