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Coltan , the industrial name for a columbite–tantalite mineral from which niobium and tantalum are extracted , can also be found in Central Africa , which is why tantalum is being linked to warfare in the Democratic Republic of the Congo ( formerly Zaire ) .
 Central Africa, Democratic Republic of the Congo, Zaire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Central Africa, Democratic Republic of the Congo, Zaire