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He competed in the Soling class together with Jochen Schümann and Thomas Flach at the 1988 Summer Olympics in Seoul , where they won the gold medal .
 Jochen Schümann, Thomas Flach, Seoul
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jochen Schümann, Thomas Flach, Seoul