what is the profession of american football head coach?
Entity
m.02y5kn
Coach
class class entity
people.profession people.profession m.01xljvt
people.profession people.profession type.type
Profession Profession American football head coach
none none none
people.profession.specializations people.profession.corresponding_type
Specializations Corresponding type
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 :people.profession . 
?x1 :type.object.type :people.profession . 
VALUES ?x2 { :m.01xljvt } 
?x0 :people.profession.specializations ?x1 . 
?x1 :people.profession.corresponding_type ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND people.profession (JOIN people.profession.specializations (JOIN people.profession.corresponding_type m.01xljvt)))