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In the 1930s and 1940s Seán MacEntee was considered Lemass 's closest rival for the top job .
 Seán MacEntee, Lemass
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Seán MacEntee, Lemass