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Иоганн Мартин Шлейер (Johann Martin Schleyer). Эсперанто (Esperanto) — ISO: eo, epo. 1887. Людвик Лазарь Заменгоф (Ludwig Lazarus Zamenhof).
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Zamenhof Day (Esperanto: Zamenhofa Tago), also called Esperanto Book Day, is celebrated on 15 December, the birthday of Esperanto creator L. L. Zamenhof. It is the most widely celebrated day in Esperanto culture.
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