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At its peak it had many as 500,000 people , and its capital was known as Mbanza-Kongo ( south of Matadi , in modern-day Angola ) .
 Mbanza-Kongo, Matadi, Angola
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mbanza-Kongo, Matadi, Angola