Question: How many plucked string instruments are played by both pianists and harpsichordists?
Choices: 0
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SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "plucked string instrument" . ?e <used_by> ?e_1 . ?e_1 <pred:name> "pianist" .  ?e <used_by> ?e_2 . ?e_2 <pred:name> "harpsichordist" .  }
Program:
function: Find
inputs: pianist
function: Relate
dependencies: 0
inputs: used by
backward
function: FilterConcept
dependencies: 1
inputs: plucked string instrument
function: Find
inputs: harpsichordist
function: Relate
dependencies: 3
inputs: used by
backward
function: FilterConcept
dependencies: 4
inputs: plucked string instrument
function: And
dependencies: 2
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function: Count
dependencies: 6
Answer: 0