Question: How many plucked string instruments are used by the keyboardist that uses the harpsichord?
Choices:
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Answer: 1
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:instance_of> ?c_1 . ?c_1 <pred:name> "keyboardist" . ?e_2 <used_by> ?e_1 . ?e_2 <pred:name> "harpsichord" .   }
Program:
function: Find
inputs: harpsichord
function: Relate
dependencies: 0
inputs: used by
forward
function: FilterConcept
dependencies: 1
inputs: keyboardist
function: Relate
dependencies: 2
inputs: used by
backward
function: FilterConcept
dependencies: 3
inputs: plucked string instrument
function: Count
dependencies: 4