227843
This area , called Padule della Trappola , extends around the Tower of Trappola , an ancient Medieval forification put to use for harvesting salt in the following centuries , for its closeness to some salt-works now disappeared .
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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:
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