Question: Among the rivers located in the North America continent, which one has the smallest discharge?
Choices:
Rhine
Ohio River
Hudson River
Columbia River
River Thames
Amazon
County Kilkenny
Mississippi River
Missouri River
Danube
Program:
function: Find
inputs: North America
function: Relate
dependencies: 0
inputs: continent
backward
function: FilterConcept
dependencies: 1
inputs: river
function: SelectAmong
dependencies: 2
inputs: discharge
smallest
SPARQL: SELECT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "river" . ?e <continent> ?e_1 . ?e_1 <pred:name> "North America" .  ?e <discharge> ?pv . ?pv <pred:value> ?v .  } ORDER BY ?v LIMIT 1
Answer: Hudson River