73189
An - coloring of an rook 's graph may be interpreted as a Latin square : it describes a way of filling the rows and columns of an grid with different values in such a way that the same value does not appear twice in any row or column .
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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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