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Leonhard Euler Telescope , or Swiss 1.2-m Leonhard Euler Telescope , is a diameter aperture reflecting telescope at the Geneva Observatory at La Silla Observatory .
 Leonhard Euler, Leonhard Euler, Geneva
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leonhard Euler, Leonhard Euler, Geneva