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These interferograms are accurately reproduced , or predicted , by the N-slit interferometric equation for either even ( N = 2 , 4 , 6 , … ) , or odd ( N = 3 , 5 , 7 , … ) , numbers of slits .
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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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