Question: How many rivers are the tributary of the Mississippi River?
Choices:
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Answer: 2
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "river" . ?e_1 <tributary> ?e . ?e_1 <pred:name> "Mississippi River" .   }
Program:
function: Find
inputs: Mississippi River
function: Relate
dependencies: 0
inputs: tributary
forward
function: FilterConcept
dependencies: 1
inputs: river
function: Count
dependencies: 2