Question: What person is the screenwriter of the film that has Steve Vai as a member of the cast?
Choices: Richard Linklater
Rob Zombie
Michael Imperioli
William Faulkner
Scott Bradley
Ben Affleck
Walter Hill
Cameron Crowe
Rabindranath Tagore
Michael Palin
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e_1 <screenwriter> ?e . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "film" . ?e_1 <cast_member> ?e_2 . ?e_2 <pred:name> "Steve Vai" .   }
Program:
function: Find
inputs: Steve Vai
function: Relate
dependencies: 0
inputs: cast member
backward
function: FilterConcept
dependencies: 1
inputs: film
function: Relate
dependencies: 2
inputs: screenwriter
forward
function: FilterConcept
dependencies: 3
inputs: human
function: What
dependencies: 4
Answer: Walter Hill