They did some experimentation with a Czech/Slovak colleagues, but those two languages are quite close already. I'm not sure if they ever got the chance to pract

They did some experimentation with a Czech/Slovak colleagues, but those two languages are quite close already. I'm not sure if they ever got the chance to practice with a slavic language that is further removed from Polish. I recall watching this video at the time (which might have been their inspiration to start learning it). https://www.youtube.com/watch?v=NztgXMLwv4A https://www.youtube.com/watch?v=NztgXMLwv4A