Question: What is the official name of Athens (that is the twin administrative body to Beijing)?
Choices: Rouen
山东省
Αθήνα
Leedu Vabariik
Royal Arsenal F.C.
ФК Локомотив
منتخب مصر الوطني لكرة القدم
Harkov
Klubi i Futbollit Tirana
République fédérale d'Allemagne
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:name> "Athens" . ?e <twinned_administrative_body> ?e_1 . ?e_1 <pred:name> "Beijing" .  ?e <official_name> ?pv .  }
Program:
function: Find
inputs: Beijing
function: Relate
dependencies: 0
inputs: twinned administrative body
backward
function: Find
inputs: Athens
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: official name
Answer: Αθήνα