21752
 Michael J. Sullivan , the United States attorney for Massachusetts , and Kenneth Kaiser , the special agent in charge of the F.B.I. 's Boston office , said in a statement that the authorities had received a tip that was '' uncorroborated and of unknown reliability '' about such a plot . 
 location contains: Massachusetts, Boston
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: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 location contains: Massachusetts, Boston