Question: How many Virginia counties are a part of the metropolitan area that includes Prince George's County as a component?
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Answer: 2
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "county of Virginia" . ?e <part_of> ?e_1 . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "metropolitan area" . ?e_1 <has_part> ?e_2 . ?e_2 <pred:name> "Prince George's County" .   }
Program:
function: Find
inputs: Prince George's County
function: Relate
dependencies: 0
inputs: has part
backward
function: FilterConcept
dependencies: 1
inputs: metropolitan area
function: Relate
dependencies: 2
inputs: part of
backward
function: FilterConcept
dependencies: 3
inputs: county of Virginia
function: Count
dependencies: 4