Question: What is the official website for the association football club with a headquarters in Southend-on-Sea?
Choices: https://www.southendunited.co.uk/
http://www.mdx.ac.uk
http://www.miranda-richardson.com
http://www.sportrecife.com.br/
https://www.warnerbros.com/town
http://www.grammy.com/en
http://www.lansingmi.gov/
https://www.uq.edu.au
http://devils.nhl.com/
http://www.exeter.edu/
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "association football club" . ?e <headquarters_location> ?e_1 . ?e_1 <pred:name> "Southend-on-Sea" .  ?e <official_website> ?pv .  }
Program:
function: Find
inputs: Southend-on-Sea
function: Relate
dependencies: 0
inputs: headquarters location
backward
function: FilterConcept
dependencies: 1
inputs: association football club
function: QueryAttr
dependencies: 2
inputs: official website
Answer: https://www.southendunited.co.uk/