84406
Shape A dewbow is centred on the antisolar point but as the dew is on a horizontal plane , the bow is not a circular arc , but often elliptical or an open arc shape in a parabola or hyperbola .
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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:
 None