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I don't plan to learn a specific Slavic language, but I want to be able to grasp the subject of any text written in any Slavic language. The constructed languages Slovianto and Interslavic look interesting to me, since they use the common words of Slavic languages and simplify the grammar. The main problem is Interslavic has very few speakers and few resources.
Despite these possible shortcomings, what are the benefits of learning Slovianto or Interslavic?