Question: What is the Twitter username of the television series with Joan Rivers as a cast member?
Choices:
victoriabeckham
EdgarRBurroughs
yanntiersen
_juliannemoore
superstarrajini
Alyssa_Milano
DavidLeeRoth
awtribute
Udinese_1896
HotelT
Answer: awtribute
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "television series" . ?e <cast_member> ?e_1 . ?e_1 <pred:name> "Joan Rivers" .  ?e <Twitter_username> ?pv .  }
Program:
function: Find
inputs: Joan Rivers
function: Relate
dependencies: 0
inputs: cast member
backward
function: FilterConcept
dependencies: 1
inputs: television series
function: QueryAttr
dependencies: 2
inputs: Twitter username