Question: Which is the shortest among the feature films that mainly depict time travel?
Choices: Old Dogs
Prince of Persia: The Sands of Time
Harry Potter and the Prisoner of Azkaban
Back to the Future Part II
G-Force
The Santa Clause 3: The Escape Clause
Alvin and the Chipmunks: Chipwrecked
Holes
Back to the Future Part III
National Treasure: Book of Secrets
SPARQL: SELECT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "feature film" . ?e <main_subject> ?e_1 . ?e_1 <pred:name> "time travel" .  ?e <duration> ?pv . ?pv <pred:value> ?v .  } ORDER BY ?v LIMIT 1
Program:
function: Find
inputs: time travel
function: Relate
dependencies: 0
inputs: main subject
backward
function: FilterConcept
dependencies: 1
inputs: feature film
function: SelectAmong
dependencies: 2
inputs: duration
smallest
Answer: The Santa Clause 3: The Escape Clause