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Licensing
This work is in the public domain in Russia in accordance with Article 1281 of the fourth Civil Code of the Russian Federation No. 230-FZ of December 18, 2006 and Article 6 of the Federal Law of the Russian Federation No. 231-ФЗ of December 18, 2006 “On the Implementation of the Part of Code of the Russian Federation ". This work is also in the public domain in the United States, since it was in the public domain in Russia (as a country of origin) on January 1, 1996.