Question: What is the local dialing code of the area of London whose OS grid reference is TQ335655?
Choices: 0118
0821
870
08615
0131
01733
020
419
330
072
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "area of London" . ?e <OS_grid_reference> ?pv_1 . ?pv_1 <pred:value> "TQ335655" . ?e <local_dialing_code> ?pv .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: OS grid reference
TQ335655
function: FilterConcept
dependencies: 1
inputs: area of London
function: QueryAttr
dependencies: 2
inputs: local dialing code
Answer: 020