Question: Which big city's official name is Mainz?
Choices: Nice
Augsburg
Stuttgart
Halle (Saale)
Mainz
Lyon
Reims
Kiel
Utrecht
Milwaukee
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "big city" . ?e <official_name> ?pv . ?pv <pred:value> "Mainz" .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: official name
Mainz
function: FilterConcept
dependencies: 1
inputs: big city
function: What
dependencies: 2
Answer: Mainz