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In 1873 , the old capital Buda and Óbuda were officially united with Pest , thus creating the new metropolis of Budapest .
 Buda, Óbuda, Pest, Budapest
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Buda, Óbuda, Pest, Budapest