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She became a Member of the Senate on September 17 , 1974 and on June 5 , 1976 she succeed Harm van Riel as the Parliamentary leader of the People 's Party for Freedom and Democracy in the Senate after he retired .
 Harm van Riel, People 's Party for Freedom and Democracy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Harm van Riel, People 's Party for Freedom and Democracy