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Pralea Coal Mine is an open-pit mining exploitation , one of the largest in Romania located in Căiuți , Bacău County with estimated coal reserves of 5.5 million tonnes .
 Coal, Romania, Bacău County
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Coal, Romania, Bacău County