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The current Ambassador of Guyana to Russia is Laleshwar Singh , resident in London and whom presented his Letters of Credence to Russian President Boris Yeltsin on 20 June 1995 .
 Guyana, Laleshwar Singh, London, Boris Yeltsin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Guyana, Laleshwar Singh, London, Boris Yeltsin