Question: What is the official website for the class of instruments that have a Hornbostel-Sachs classification of 521?
Choices: http://www.american.edu/
http://www.yemen.gov.ye/
http://warpfilms.com/feature/submarine/
http://www.hammondsuzuki.com
http://www.dorchester-tc.gov.uk/
http://www.uppsala.se/
https://www.pafc.co.uk/
http://theofficialcharlieadler.com
http://www.shelbournefc.ie
http://www.law.stanford.edu/
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "class of instruments" . ?e <Hornbostel-Sachs_classification> ?pv_1 . ?pv_1 <pred:value> "521" . ?e <official_website> ?pv .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: Hornbostel-Sachs classification
521
function: FilterConcept
dependencies: 1
inputs: class of instruments
function: QueryAttr
dependencies: 2
inputs: official website
Answer: http://www.hammondsuzuki.com