Question: What electronic musical instrument's famous persons are John Frusciante and Al Jourgensen?
Choices: Vocoder
electronic drum
goblet drum
bass guitar
guitar
Omnichord
sampler
drum machine
theremin
keytar
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "electronic musical instrument" . ?e <famous_people> ?e_1 . ?e_1 <pred:name> "John Frusciante" .  ?e <famous_people> ?e_2 . ?e_2 <pred:name> "Al Jourgensen" .  }
Program:
function: Find
inputs: John Frusciante
function: Relate
dependencies: 0
inputs: famous people
backward
function: FilterConcept
dependencies: 1
inputs: electronic musical instrument
function: Find
inputs: Al Jourgensen
function: Relate
dependencies: 3
inputs: famous people
backward
function: FilterConcept
dependencies: 4
inputs: electronic musical instrument
function: And
dependencies: 2
5
function: What
dependencies: 6
Answer: drum machine