Question: What is the official website of the person who received Nebula Award for Best Novella (the point in time of this statement is 1978)?
Choices: https://www.apple.com/it/ios/
http://www.lakecountyor.org
http://www.varley.net
http://www.coimbatore.gov.in/
https://www.afc.co.uk/
http://www.ci.durham.nc.us/
http://www.yorkcountyme.gov
http://www.madghostproductions.com
http://www.ala.org/alsc/awardsgrants/bookmedia/newberymedal/newberymedal
http://www.kirkfranklin.com
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e <award_received> ?e_1 . ?e_1 <pred:name> "Nebula Award for Best Novella" .  [ <pred:fact_h> ?e ; <pred:fact_r> <award_received> ; <pred:fact_t> ?e_1 ] <point_in_time> ?qpv . ?qpv <pred:year> 1978 . ?e <official_website> ?pv .  }
Program:
function: Find
inputs: Nebula Award for Best Novella
function: Relate
dependencies: 0
inputs: award received
backward
function: QFilterYear
dependencies: 1
inputs: point in time
1978
=
function: FilterConcept
dependencies: 2
inputs: human
function: QueryAttr
dependencies: 3
inputs: official website
Answer: http://www.varley.net