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Lifted from the Grassmannian , which is a homogeneous space , to the general linear group that acts on it , similar questions are involved in the Bruhat decomposition and classification of parabolic subgroup s ( by block matrix ) .
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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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