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Their daughter Sabine Herbst-Klenz ( born 1974 ) and son Stefan Herbst are also retired Olympic swimmers .
 Sabine Herbst-Klenz, Stefan Herbst
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sabine Herbst-Klenz, Stefan Herbst