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In page Yugoslavia:

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The three major languages in Yugoslavia were Serbo-Croatian, Slovenian, and Macedonian.[1] Serbo-Croatian, the only language taught all across former Yugoslavia, remained the second language of many Slovenes[2] and Macedonians, especially those born during the time of Yugoslavia. After the breakup of Yugoslavia, Serbo-Croatian has lost its unitary codification and its official unitary status and has since diverged into four standardized varieties of what remains one pluricentric language: Bosnian, Croatian, Montenegrin and Serbian.[citation needed]