Question: What frequency does Cameroon (main voltage 220 volts) operate at?
Choices: 50
Israel–Mali relations
13H2
sciencespo
50 hertz
180.3 centimetre
55513358
55 hertz
Signal Corps
60 hertz
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:name> "Cameroon" . ?e <mains_voltage> ?pv . ?pv <pred:unit> "volt" . ?pv <pred:value> "220"^^xsd:double . [ <pred:fact_h> ?e ; <pred:fact_r> <mains_voltage> ; <pred:fact_t> ?pv ] <frequency> ?qpv .  }
Program:
function: Find
inputs: Cameroon
function: QueryAttrQualifier
dependencies: 0
inputs: mains voltage
220 volt
frequency
Answer: 50 hertz