17896
 The time was the early 1960 's , when the Boston area was traumatized by a series of rape-murders believed to be perpetrated by a single predator who came to be known as the Boston Strangler . 
 Boston Strangler, Boston
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 Boston Strangler, Boston