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The objects introduced by Schubert are the Schubert cells , which are locally closed sets in a Grassmannian defined by conditions of incidence of a linear subspace in projective space with a given flag .
 Schubert, Schubert
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Schubert, Schubert