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Birrell became the Leader of the Liberal Party in the Legislative Council from 1988 and in 1992 he became the Government Leader of the Upper House , a position he would hold through to 1999 .
 Birrell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Birrell