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The Niger Delta Liberation Front ( NDLF ) is a militant group in Nigeria 's Niger Delta .
 location: Delta; location: Nigeria; location: Delta
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: Delta; location: Nigeria; location: Delta