Question: Which big city is the twinned administrative body of a city whose German district key was 16053 since 1987 ?
Choices: Utrecht
Halle (Saale)
Dnipro
Hamburg
Marseille
Magdeburg
Aachen
Erlangen
Stuttgart
Mainz
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "big city" . ?e_1 <twinned_administrative_body> ?e . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "city" . ?e_1 <German_district_key> ?pv . ?pv <pred:value> "16053" .  [ <pred:fact_h> ?e_1 ; <pred:fact_r> <twinned_administrative_body> ; <pred:fact_t> ?e ] <start_time> ?qpv . ?qpv <pred:year> 1987 .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: German district key
16053
function: FilterConcept
dependencies: 1
inputs: city
function: Relate
dependencies: 2
inputs: twinned administrative body
forward
function: QFilterYear
dependencies: 3
inputs: start time
1987
=
function: FilterConcept
dependencies: 4
inputs: big city
function: What
dependencies: 5
Answer: Erlangen