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In the 21st century , ESA started new programmes in order to create its own crew vehicles , most notable among its various projects and proposals is Phoenix , whose prototype by Hopper , called Russian Space Agency , has already been tested .
 ESA, Hopper, Russian Space Agency
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 ESA, Hopper, Russian Space Agency