They split into Czech Republic and Slovakia. I'm not totally sure on this but I thought it was in 1993.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 5 words with the pattern -UBTO---. That is, eight letter words with 2nd letter U and 3rd letter B and 4th letter T and 5th letter O. In alphabetical order, they are: subtones subtonic subtopia subtopic subtotal