Question: What is the musical instrument that plays famous people like Stevie Nicks?
Choices:
mandolin
harmonica
cowbell
hard rock
synthesizer
piano
Fender Precision Bass
Percussion
country rock
lute
Answer: Percussion
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "musical instrument" . ?e <famous_people> ?e_1 . ?e_1 <pred:name> "Stevie Nicks" .   }
Program:
function: Find
inputs: Stevie Nicks
function: Relate
dependencies: 0
inputs: famous people
backward
function: FilterConcept
dependencies: 1
inputs: musical instrument
function: What
dependencies: 2