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According to a ca. 1723 account by the French Jesuits Dominique Parrenin , there was a well in Dong ' e which was normally kept closed and sealed , and which was only opened when water was taken to be used in preparation of ejiao for the emperor 's court .
 Dominique Parrenin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dominique Parrenin