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According to Alexander Wendt , " Security dilemmas are not given by anarchy or nature " but , rather , are " a social structure composed of intersubjective understandings in which states are so distrustful that they make worst-case assumptions about each other 's intentions " .
 Alexander Wendt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Alexander Wendt