Question: Which port city on the European continent is highest in elevation?
Choices: İzmir
Alexandria
Gibraltar
Tianjin
48th Academy Awards
Fremantle
Barcelona
Basra
Odessa
Busan
SPARQL: SELECT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "port city" . ?e <continent> ?e_1 . ?e_1 <pred:name> "Europe" .  ?e <elevation_above_sea_level> ?pv . ?pv <pred:value> ?v .  } ORDER BY DESC(?v) LIMIT 1
Program:
function: Find
inputs: Europe
function: Relate
dependencies: 0
inputs: continent
backward
function: FilterConcept
dependencies: 1
inputs: port city
function: SelectAmong
dependencies: 2
inputs: elevation above sea level
largest
Answer: Odessa