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Largely complete by 1230 , the castle was of typical Norman courtyard design , with a central square without a keep , bounded on all sides by tall defensive walls and protected at each corner by a circular tower .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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