Question: What number of progressive rock was conceived before 1990?
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Answer: 1
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "progressive rock" . ?e <inception> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 1990 ) .  }
Program:
function: FindAll
function: FilterYear
dependencies: 0
inputs: inception
1990
<
function: FilterConcept
dependencies: 1
inputs: progressive rock
function: Count
dependencies: 2