Question: What is the OS grid reference of Birkenhead?
Choices: SP1955
ST745645
SD475615
SU860048
SJ805985
SE164331
NS338214
NS325395
SJ324890
TL055495
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:name> "Birkenhead" . ?e <OS_grid_reference> ?pv .  }
Program:
function: Find
inputs: Birkenhead
function: QueryAttr
dependencies: 0
inputs: OS grid reference
Answer: SJ324890