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In probability theory and statistics , the normal-inverse-gamma distribution ( or Gaussian-inverse-gamma distribution ) is a four-parameter family of multivariate continuous probability distribution s. It is the conjugate prior of a normal distribution with unknown mean and variance .
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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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