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Astronomer Jean-Luc Margot proposed a mathematical criterion that determines whether an object can clear its orbit during the lifetime of its host star , based on the mass of the planet , its semimajor axis , and the mass of its host star .
 Jean-Luc Margot
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Jean-Luc Margot