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He became a senior policy officer for Leen van der Waal , a Member of the European Parliament for a joint RPF-GPV-SPG ( Reformed Political Party ) ticket in 1984 .
 Leen van der Waal, Parliament, Reformed Political Party
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leen van der Waal, Parliament, Reformed Political Party