Question: Was Gary Copper (the one that plays the instrument piano) born in 1908?
Choices:
yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
Answer: no
SPARQL: ASK { ?e <pred:name> "Gary Cooper" . ?e <instrument> ?e_1 . ?e_1 <pred:name> "piano" .  ?e <date_of_birth> ?pv . ?pv <pred:year> 1908 .  }
Program:
function: Find
inputs: piano
function: Relate
dependencies: 0
inputs: instrument
backward
function: Find
inputs: Gary Cooper
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: date of birth
function: VerifyYear
dependencies: 4
inputs: 1908
=