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Activities in the park The planet path streches from the Sun on the hill to the outermost planet Pluto 5.9 km away ( in 2000 when the planet path was first created as a public elementary school project , Pluto was still considered a planet ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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