Question: What number of airlines operate Boeing 747s?
Choices: 0
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SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "airline" . ?e <item_operated> ?e_1 . ?e_1 <pred:name> "Boeing 747" .   }
Program:
function: Find
inputs: Boeing 747
function: Relate
dependencies: 0
inputs: item operated
backward
function: FilterConcept
dependencies: 1
inputs: airline
function: Count
dependencies: 2
Answer: 1