Question: How many airlines have the hub airport at Bath Iron Works?
Choices:
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Answer: 0
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "airline" . ?e <airline_hub> ?e_1 . ?e_1 <pred:name> "Bath Iron Works" .   }
Program:
function: Find
inputs: Bath Iron Works
function: Relate
dependencies: 0
inputs: airline hub
backward
function: FilterConcept
dependencies: 1
inputs: airline
function: Count
dependencies: 2