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As Tripoli came under attack , other rebel forces based in Benghazi broke the military stalemate in the eastern desert , taking Brega and Ra 's Lanuf .
 Tripoli, Benghazi, Brega, Ra 's Lanuf
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tripoli, Benghazi, Brega, Ra 's Lanuf