<prompt> Feleletša polelwana ye e latelago: O thopile sefoka sa gauta ka go papadi ya ballet ya go thelela godimo ga lehlwa FIS Freestyle World Ski Championships 1997, le sefoka sa silifera go  <response>: FIS Freestyle World Ski Championships ya 1999. O ile a ba a phenkgišana dithulanong tša lefase tša 1991 le 1995. 