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Navajo

Navajo is an ancient Native American language whose difficulty stems from its vast differences with English. During WWII, the US Army sent communication messages encoded in Navajo because the the Japanese didn't have access to any grammar references. Navajo is abstract and entirely foreign. The language is so tied to Navajo thought processes that it's difficult to grasp for anyone other than natives. Navajo is peculiar in that not all letters map into English, it's tonal like Chinese, the grammar is completely foreign, and the same words can have different meanings based on the length of pause between syllables.