Question: What is the number of businesses that operate Boeing 737
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Answer: 3
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "business" . ?e <item_operated> ?e_1 . ?e_1 <pred:name> "Boeing 737" .   }
Program:
function: Find
inputs: Boeing 737
function: Relate
dependencies: 0
inputs: item operated
backward
function: FilterConcept
dependencies: 1
inputs: business
function: Count
dependencies: 2