who was the us president nixon's vice president?
Entity Entity
m.0c_md_ m.09r62
Gerald Ford Spiro Agnew
class entity
government.us_vice_president m.06c97
government.us_vice_president government.us_president
US Vice President nixon
none none
government.us_vice_president.to_president
President
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 :government.us_vice_president . 
VALUES ?x1 { :m.06c97 } 
?x0 :government.us_vice_president.to_president ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND government.us_vice_president (JOIN government.us_vice_president.to_president m.06c97))