<prompt> Feleletša polelo ye e latelago: O thopile sefoka sa gauta ka acroski ballet ya ski kua  <response>: FIS Freestyle World Ski Championships ka 1986 kua Tignes. Kua FIS Freestyle World Ski Championships ka 1989 kua Oberjoch, o thopile sefoka sa bobedi sa gauta ka go ski ballet. O thopile sefoka sa silifera ka go ski ballet ka FIS Freestyle World Ski Championships 1991 ka Lake Placid. 