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according to "http://www.juggle.com/varna" "Hristo Borisov Hall is an arena in Varna, Bulgaria. The arena holds 1,100 people, and it is primarily used for basketball and volleyball. The arena is home to basketball team Euroins Cherno More." it seems to indicate that the Palace of Culture and Sports is separate.
it would also probibly be best to merge it into the Euroins Cherno More page because the "www.palaceofvarna.com" webpage does not seem to mention it. i did use the english version of the page, so i might be wrong because the translation could be imperfect.