Question: What is the official website of Vancouver USA?
Choices:
http://www.johncorbettband.com/
https://www.cityofvancouver.us/
http://www.seussville.com/
http://www.accessfayetteville.org
http://www.errolflynn.net
http://www.williamsanderson.net/
https://www.olympic.org/paris-1900
http://phantomvox.com/
https://www.forbes.com
http://www.statenislandnymovie.com
Answer: https://www.cityofvancouver.us/
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:name> "Vancouver" . ?e <country> ?e_1 . ?e_1 <pred:name> "United States of America" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: United States of America
function: Relate
dependencies: 0
inputs: country
backward
function: Find
inputs: Vancouver
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: official website