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SADR was proclaimed by the Polisario Front on February 27 , 1976 , in Bir Lehlu , Western Sahara .
 Polisario Front, Bir Lehlu, Sahara
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Polisario Front, Bir Lehlu, Sahara