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This book offers a practical grammar and exercises for Linguo Internaciona di la Delegitaro, or Ido, which was a constructed language created in 1907 as an improvement on the highly successful Esperanto by supporters of the Delegation for the Adoption of an International Auxiliary Language. Hugon's book provides a comprehensive guide to the language for new learners and experienced speakers alike. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.