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From 1998 to 2003 he returned to study at the Computer Science and Engineering Department of Huazhong University of Science and Technology , earning a Ph.D. .
 Science, Huazhong, Science, Technology
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Science, Huazhong, Science, Technology