Question: What violin is known as the instrument used by Sam Bush, and associated wirh Hal Smith (the one whose date of death is 1994-01-28)?
Choices:
hurdy-gurdy
harp
electric violin
harpsichord
Appalachian dulcimer
viola
goblet drum
fiddle
double bass
ukulele
Program:
function: Find
inputs: Sam Bush
function: Relate
dependencies: 0
inputs: instrument
forward
function: FilterConcept
dependencies: 1
inputs: violin
function: Find
inputs: Hal Smith
function: FilterDate
dependencies: 3
inputs: date of death
1994-01-28
=
function: Relate
dependencies: 4
inputs: famous people
backward
function: FilterConcept
dependencies: 5
inputs: violin
function: And
dependencies: 2
6
function: What
dependencies: 7
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "violin" . ?e_1 <instrument> ?e . ?e_1 <pred:name> "Sam Bush" .  ?e <famous_people> ?e_2 . ?e_2 <pred:name> "Hal Smith" . ?e_2 <date_of_death> ?pv . ?pv <pred:date> "1994-01-28"^^xsd:date .  }
Answer: fiddle