Completed the following sentence: The Handball Federation of Slovenia was formed on 11 December 1949 under the former Handball federation of Yugoslavia. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Slovan, Celje and Rudar Trbovlje were the only Slovenian teams that played in the Yugoslav First League. <unk><unk><unk><unk><unk><unk><unk><unk><unk><unk><unk>
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