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He also accompanied El-Ouali Mustapha Sayed , then POLISARIO General Secretary , to the first interview with the Sahrawi National Union Party General Secretary Khelli Henna Ould Rachid in Mauritania .
 El-Ouali Mustapha Sayed, Sahrawi National Union Party, Khelli Henna Ould Rachid, Mauritania
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 El-Ouali Mustapha Sayed, Sahrawi National Union Party, Khelli Henna Ould Rachid, Mauritania