what html layout engine is used by the web browser developed by mozilla corp?
Entity
m.0cgj4
Gecko
class class entity
computer.html_layout_engine computer.web_browser m.021sfk
computer.html_layout_engine computer.web_browser computer.software_developer
HTML Layout Engine Web browser mozilla corp
none none none
computer.html_layout_engine.browsers computer.software.developer
Browsers Developer
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :computer.html_layout_engine . 
?x1 :type.object.type :computer.web_browser . 
VALUES ?x2 { :m.021sfk } 
?x0 :computer.html_layout_engine.browsers ?x1 . 
?x1 :computer.software.developer ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND computer.html_layout_engine (JOIN computer.html_layout_engine.browsers (JOIN computer.software.developer m.021sfk)))