Question: What written work is mainly about Christmas?
Choices: Arthur Christmas
Love Actually
Zodiac
Crash
A Christmas Carol
The Holiday
The Santa Clause 2
Die Hard
Catch-22
Charlie and the Chocolate Factory
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "written work" . ?e <main_subject> ?e_1 . ?e_1 <pred:name> "Christmas" .   }
Program:
function: Find
inputs: Christmas
function: Relate
dependencies: 0
inputs: main subject
backward
function: FilterConcept
dependencies: 1
inputs: written work
function: What
dependencies: 2
Answer: A Christmas Carol