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It managed to be the highest mountain of the Kingdom of Hungary , and of the countries of Czechoslovakia , Slovakia and then Czechoslovakia again within the span of less than three decades of the 20th century .
 Kingdom of Hungary, Czechoslovakia, Slovakia, Czechoslovakia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kingdom of Hungary, Czechoslovakia, Slovakia, Czechoslovakia