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Unfortunately , he lost the qualifying round match to Estonia 's Ardo Arusaar , who was able to score five points in two straight periods , leaving Caraballo without a single point .
 Ardo Arusaar
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ardo Arusaar