4159
 With a handful of helpers , Ms. Suthers , a retired Princeton research assistant , is capturing birds that breed in these Mercer County woods and recording their age , sex , size , weight , condition , even the color of their eyes and tongues . 
 location contains: Mercer County, Princeton
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Mercer County, Princeton 
Answer:
 location contains: Mercer County, Princeton