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He competed at the 1968 Summer Olympics in Mexico City , where he received a gold medal in the 5.5 metre class with the boat Wasa IV , together with Jörgen Sundelin and Ulf Sundelin .
 Mexico City, Jörgen Sundelin, Ulf Sundelin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mexico City, Jörgen Sundelin, Ulf Sundelin