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The caves and bunkers were connected to a vast tunnel and trench system throughout central Peleliu , which allowed the Japanese to evacuate or reoccupy positions as needed , and to take advantage of shrinking interior lines .
 location: Peleliu
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:
 location: Peleliu