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He was the head of a research unit on organizations at Électricité de France ( EDF ) ( 1993-1997 ) .
 Électricité de France ( EDF )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Électricité de France ( EDF )