question: Which already existing schools did Northwestern affiliate itself with in the 1870 's and 1880 's ?
answer: schools of law , medicine , and dentistry in Chicago
turker_answer: Northwestern affiliate itself with the schools of law , medicine , and dentistry in Chicago in the 1870 's and 1880 's .
rule-based: Existing schools Northwestern affiliated schools of law , medicine , and dentistry in Chicago itself with in the 1870 's and 1880 's .