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Tvarditsa Koān
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Tvarditsa Koān (Bulgaria-gí: Община Твърдица) sī Bulgaria Kiōng-hô-kok Sliven Chiu ê chi̍t ê koān (obshtina).[1] Tī 2010 nî jîn-kháu phó͘-cha ê sî-chūn, chit-ê koān ū 14,927 ê lâng tòa.
Tvarditsa Koān (Bulgaria-gí: Община Твърдица) sī Bulgaria Kiōng-hô-kok Sliven Chiu ê chi̍t ê koān (obshtina).[1] Tī 2010 nî jîn-kháu phó͘-cha ê sî-chūn, chit-ê koān ū 14,927 ê lâng tòa.