Question: Who has the position of halfback?
Choices: Michael K. Williams
James Brown
William Shakespeare
Max Fleischer
William Henry Harrison
Giuseppe Colucci
Sylvester Stallone
Oscar
Richard Gere
John Davis
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e <position_played_on_team_/_speciality> ?e_1 . ?e_1 <pred:name> "halfback" .   }
Program:
function: Find
inputs: halfback
function: Relate
dependencies: 0
inputs: position played on team / speciality
backward
function: FilterConcept
dependencies: 1
inputs: human
function: What
dependencies: 2
Answer: William Shakespeare