"Which is alumna of of Ellen Swallow Richards, where located at street address is 77 Massachusetts Avenue, Cambridge, MA, 02139-4307 ?"
SELECT ?answer WHERE { wd:Q7273 wdt:P69 ?answer . ?answer wdt:P969 ?x FILTER(contains(?x,'77 Massachusetts Avenue, Cambridge, MA, 02139-4307'))}
ellen swallow richards: Q7273