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According to Middle East Economic Survey ( MEES ) , Yemen and Amoco signed a " memorandum of understanding " for a production-sharing agreement in Shabwa Block No .
 Middle East Economic Survey, MEES, Amoco, Yemen, Shabwa Block No .
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Middle East Economic Survey, MEES, Amoco, Yemen, Shabwa Block No .