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He compiled a list of them , in collaboration with his friend and assistant Pierre Méchain ( who may have found at least 20 of the objects ) , to avoid wasting time sorting them out from the comets they were looking for .
 Pierre Méchain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pierre Méchain