Interslavic is a mix of all slavic languages. From my understanding they made a language using words that are most common in most. so in theory you should understand at least 70-80% of it by only knowing 1 slavic language.
i seen it years ago but i accidentally found a translator yesterday.
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ja imam osecaj kao da slusam mix makedonskog, slovencakog i ruskog ili ukrainskog :)
When I paid attention, I did understand a lot of it, but I suppose if you know more than 1 Slavic language, you can understand even more... :)