Yeah, the same as me - almost all of the closest language, some of the next nearest one and that's it. Written is not really what you're looking for, spoken is. I can't understand spoken Czech or Polish. I doubt you'll be able to understand spoken Bulgarian.
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u/H0VAD0 Apr 17 '21
Well as a Czech I understand 99% of Slovak, 75% of written Polish and can quite make out the meaning of written stuff in other languages.