Question: Pianist Frank Vincent has what connection to the piano?
Choices: location of discovery
original film format
series spin-off
located in the administrative territorial entity
instrument
material used
has quality
sports season of league or competition
studied by
hair color
SPARQL: SELECT DISTINCT ?p WHERE { ?e_1 <pred:name> "Frank Vincent" . ?e_1 <instrument> ?e_3 . ?e_3 <pred:name> "piano" . ?e_2 <pred:name> "piano" . ?e_1 ?p ?e_2 .  }
Program:
function: Find
inputs: piano
function: Relate
dependencies: 0
inputs: instrument
backward
function: Find
inputs: Frank Vincent
function: And
dependencies: 1
2
function: Find
inputs: piano
function: QueryRelation
dependencies: 3
4
Answer: instrument