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Gerrit ( Gert ) van den Berg ( born October 10 , 1935 , in Rotterdam ) is a former Dutch politician .
 Gert, van den Berg, Rotterdam, Dutch
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gert, van den Berg, Rotterdam, Dutch