202521
Roelf Hendrik de Boer ( born 9 October 1949 , Rotterdam ) is a Dutch politician .
 Roelf, Boer, 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:
 Roelf, Boer, Rotterdam, Dutch