<prompt> Feleletša polelwana e latelago: O thopile sefoka sa gauta ka dipapading tša dipapadi tša go fofa godimo ga meetse tša FIS Freestyle World Ski Championships ka 1989 kua Oberjoch. O ile a ba a phenkgišana le  <response>: 1986 lefelo la seswai le 1991 lefelo la bohlano difoka tša lefase. 