Question: How many string instruments do we know with Hornbostel-Sachs classification of 321.322-71, that were used by a pianist?
Choices:
0
1
2
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9
Program:
function: Find
inputs: pianist
function: Relate
dependencies: 0
inputs: uses
forward
function: FilterConcept
dependencies: 1
inputs: string instrument
function: FindAll
function: FilterStr
dependencies: 3
inputs: Hornbostel-Sachs classification
321.322-71
function: FilterConcept
dependencies: 4
inputs: string instrument
function: And
dependencies: 2
5
function: Count
dependencies: 6
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "string instrument" . ?e_1 <uses> ?e . ?e_1 <pred:name> "pianist" .  ?e <Hornbostel-Sachs_classification> ?pv . ?pv <pred:value> "321.322-71" .  }
Answer: 0