2488
Four students from  North Carolina Agricultural and Technical State University  ( NC ) started the  Greensboro  sit-ins at a whites only lunch counter on February 1 1960 .
 city of headquarters: North Carolina Agricultural and Technical State University, Greensboro
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 city of headquarters: North Carolina Agricultural and Technical State University, Greensboro