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In May 2001 Gummerus Publishers acquired an independent , smaller publishing firm by the name of Ajatus Kustannusosakeyhtiö , and Ajatus Kirjat remains an editorially independent non-fiction entity within the main publishing firm .
 Gummerus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gummerus