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Since the early 1970s the excavations focused on the Troitza ( Trinity ) area of the ancient Ludin part of town , covering nearly 6,000 square meters ( 64,500 square feet ) .
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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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