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Three distinct dune types are visible : longitudinal dunes , which are more or less parallel with the north winds ; transverse dunes , which are usually more curved and formed at right angles to the wind ; and star dunes , in which several linear arms converge towards a single peak .
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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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