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Ro is an a priori constructed language created by Rev. Edward Powell Foster in the 1900s. In Ro, words are constructed using a Melville Dewey, inventor of the Dewey Decimal Classification, another attempt to categorize human knowledge.
A common criticism of Ro is that it can be difficult to hear the difference between two words; usually one consonant makes the word completely different. That may have been why Ro didn't catch on as well as other constructed languages, such as Esperanto.