Question: What is the OCLC control number for the written work whose narrative location is Boulder?
Choices: 41049769
685254914
31730506
247025580
53821716
225632887
27417158
55053886
26502801
152547815
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "written work" . ?e <narrative_location> ?e_1 . ?e_1 <pred:name> "Boulder" .  ?e <OCLC_control_number> ?pv .  }
Program:
function: Find
inputs: Boulder
function: Relate
dependencies: 0
inputs: narrative location
backward
function: FilterConcept
dependencies: 1
inputs: written work
function: QueryAttr
dependencies: 2
inputs: OCLC control number
Answer: 27417158