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's Alberto Contador completed the podium , 29 seconds behind Froome and 52 seconds down on Nibali .
 Alberto Contador, Froome, Nibali
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alberto Contador, Froome, Nibali