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Rich in minerals , the Democratic Republic of the Congo has a difficult history of predatory mineral extraction , which has been at the heart of many struggles within the country for many decades , but particularly in the 1990 s .
 Democratic Republic of the Congo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Democratic Republic of the Congo