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The Leiden school of linguistics should not be confused with the current research institute of linguistics at Leiden University , the Leiden University Centre for Linguistics , LUCL ( [ 2 ] cf. also the article on structural anthropology , with a short piece on The Leiden School , as an anthropological approach very much resembling – while being a forebear – of the French structural anthropology of Cl .
 Leiden, Leiden, Leiden, Leiden
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leiden, Leiden, Leiden, Leiden