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Giggenbach Ridge ( ) is a north-south chain of summit s , 5 nautical miles ( 9 km ) long , located to the west and northwest of Mount Terror on Ross Island .
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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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