Question: What is the Twitter username of the person whose official website is http://www.davidcopperfield.com?
Choices: SamuelLJackson
D_Copperfield
adamcarolla
Udinese_1896
happytogether
fcgroningen
samsungtomorrow
theglennclose
MN_Records
ddlovato
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e <official_website> ?pv_1 . ?pv_1 <pred:value> "http://www.davidcopperfield.com" . ?e <Twitter_username> ?pv .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: official website
http://www.davidcopperfield.com
function: FilterConcept
dependencies: 1
inputs: human
function: QueryAttr
dependencies: 2
inputs: Twitter username
Answer: D_Copperfield