353391
Each one , however , satisfies at least one of the following criteria : Reference works such as the following discuss the lives and summarize the works of notable philosophers : ( Cambridge ) The Cambridge Dictionary of Philosophy , ( Second Edition ) .
 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