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For example , the orbit of each planet in the solar system is approximately an ellipse with the Sun at one focus point ( more precisely , the focus is the barycenter of the Sunplanet pair ) .
 Sunplanet
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sunplanet