Question: How many kinds of progressive rock began earlier than 1980?
Choices:
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Answer: 0
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "progressive rock" . ?e <start_time> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 1980 ) .  }
Program:
function: FindAll
function: FilterYear
dependencies: 0
inputs: start time
1980
<
function: FilterConcept
dependencies: 1
inputs: progressive rock
function: Count
dependencies: 2