what was the name of the first student practitioner of hapkido ?
Entity
m.01xrwvx
Chris Maden
class entity class literal
martial_arts.martial_artist m.0hbj9 education.education 0^^http://www.w3.org/2001/XMLSchema#int
martial_arts.martial_artist martial_arts.martial_art education.education type.datetime
Martial Artist Hapkido Education 0
none none none argmin
martial_arts.martial_art.well_known_practitioner people.person.education education.education.end_date
Practitioner Education End Date
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 :martial_arts.martial_artist . 
VALUES ?x1 { :m.0hbj9 } 
?x2 :type.object.type :education.education . 
{
SELECT (MIN(?y3) AS ?x3)  WHERE { 
?y0 :type.object.type :martial_arts.martial_artist . 
VALUES ?y1 { :m.0hbj9 } 
?y2 :type.object.type :education.education . 
?y1 :martial_arts.martial_art.well_known_practitioner ?y0 . 
?y0 :people.person.education ?y2 . 
?y2 :education.education.end_date ?y3 . 
FILTER ( ?y0 != ?y1 && ?y0 != ?y2 && ?y0 != ?y3 && ?y1 != ?y2 && ?y1 != ?y3 && ?y2 != ?y3  )
}
}
?x1 :martial_arts.martial_art.well_known_practitioner ?x0 . 
?x0 :people.person.education ?x2 . 
?x2 :education.education.end_date ?x3 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x0 != ?x3 && ?x1 != ?x2 && ?x1 != ?x3 && ?x2 != ?x3  )
}
}
(ARGMIN (AND martial_arts.martial_artist (JOIN (R martial_arts.martial_art.well_known_practitioner) m.0hbj9)) (JOIN people.person.education education.education.end_date))