<prompt> Ngwala go tšwela pele bakeng sa serapa se - O thopile sefoka sa silifera ka go bapala dipapadi tša ballet ya go thelela godimo ga thapo ski ballet go FIS Freestyle World Ski Championships 1997. O ile a ba a phenkgišana ka 1989, 1991 le 1995  <response>: diphadišano tša lefase. 