sentence1: Alla Petrovna Tsuper ( born April 16 , 1979 ) is a Ukrainian ( until 2000 ) and a Belarusian cross-country skier ( since 2000 ) .
sentence2: Alla Petrovna Tsuper ( ; ; ; born 16 April 1979 ) is a Ukrainian ( until 2000 ) and Belarusian ( since 2000 ) aerial skier .