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" Logical positivism " , later called " logical empiricism " , and both of which together are also known as " neopositivism " , was a movement in Western philosophy whose central thesis was the verification principle ( also known as the verifiability criterion of meaning ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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