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This was followed in 1713 by " Three Dialogues between Hylas and Philonous " , in which he propounded his system of philosophy , the leading principle of which is that the world , as represented by our senses , depends for its existence on being perceived .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None