Question: How many geographic regions that include Algeria have the Mississippi River as a tributary?
Choices:
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Answer: 0
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "geographic region" . ?e_1 <part_of> ?e . ?e_1 <pred:name> "Algeria" .  ?e <tributary> ?e_2 . ?e_2 <pred:name> "Mississippi River" .  }
Program:
function: Find
inputs: Algeria
function: Relate
dependencies: 0
inputs: part of
forward
function: FilterConcept
dependencies: 1
inputs: geographic region
function: Find
inputs: Mississippi River
function: Relate
dependencies: 3
inputs: tributary
backward
function: FilterConcept
dependencies: 4
inputs: geographic region
function: And
dependencies: 2
5
function: Count
dependencies: 6