| 21. | Around 500, Theodoric celebrated his thirtieth anniversary as King of the Ostrogoths.
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| 22. | He died of nephritis shortly after his thirtieth birthday.
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| 23. | He died in Hastings prior to his thirtieth birthday.
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| 24. | The team placed thirteenth and individually Vaculik placed thirtieth.
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| 25. | Its athletes finished thirtieth in the overall medal count.
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| 26. | She placed thirtieth in the Cao Ying and Australia's Lalita Yauhleuskaya.
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| 27. | In the 200 m backstroke, Karastergiou placed thirtieth in the morning prelims.
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| 28. | Is the thirtieth single by the Japanese Pop-rock band Porno Graffitti.
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| 29. | Is the thirtieth single by Japanese recording artist Misia.
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| 30. | In 1965 it was the thirtieth Italian insurance company by total insurance premiums.
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