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He previously served as Singaporean High Commissioner to Australia from March 2008 to June 2011 , and as Principal Private Secretary to Prime Minister Goh Chok Tong from March 2004 .
 Singaporean, Goh Chok Tong
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Singaporean, Goh Chok Tong