Question: Which school has 1791 postgraduates and has Robert Frost as an alumnus?
Answer(s):
answer: Dartmouth College

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.06gq_)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.06gq_ ns:people.person.education ?y .
?y ns:education.education.institution ?x .
?x ns:education.university.number_of_postgraduates ?c .
?c ns:measurement_unit.dated_integer.number "1791" . 
}