<prompt> Ngwala tšwetšopele ya serapa se - O thopile sefoka sa gauta ka dipapading tša dipapadi tša go fofa ka lefaufaung FIS Freestyle World Ski Championships 1989 kua Oberjoch. O ile a ba a phenkgišana ka 1986  <response>: Lefelo la seswai le 1991 Lefelo la bohlano difoka tša lefase. 