20959
In other words , it is a mutually beneficial agreement between two or more people ; each of them agrees to behave in a certain way towards the others so that they will behave in the same way towards him or her .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None