Question: What physics engine has the Stack Exchange tag of https://stackoverflow.com/tags/havok?
Choices: Havok
Kanagawa Prefecture
Zhang Yimou
brain tumor
The Secret in Their Eyes
Yellow Submarine
Mobile Suit Gundam
Keenan Wynn
Gotha
56th Academy Awards
SPARQL: SELECT DISTINCT ?e WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "physics engine" . ?e <Stack_Exchange_tag> ?pv . ?pv <pred:value> "https://stackoverflow.com/tags/havok" .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: Stack Exchange tag
https://stackoverflow.com/tags/havok
function: FilterConcept
dependencies: 1
inputs: physics engine
function: What
dependencies: 2
Answer: Havok