Question: Tell me the film that includes Conrad Buff IV as a film director, that has the longest duration.
Choices: Thirteen Days
Rise of the Planet of the Apes
Snow White and the Huntsman
King Arthur
True Lies
Training Day
Terminator 2: Judgment Day
Antwone Fisher
Seraphim Falls
Titanic
SPARQL: SELECT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "film" . ?e <film_editor> ?e_1 . ?e_1 <pred:name> "Conrad Buff IV" .  ?e <duration> ?pv . ?pv <pred:value> ?v .  } ORDER BY DESC(?v) LIMIT 1
Program:
function: Find
inputs: Conrad Buff IV
function: Relate
dependencies: 0
inputs: film editor
backward
function: FilterConcept
dependencies: 1
inputs: film
function: SelectAmong
dependencies: 2
inputs: duration
largest
Answer: Titanic