<prompt> Qedela umusho olandelayo: Phakathi nawo-1960, uJan Křen waba ngomunye wezazi-mlando zokuqala zaseCzechoslovakia ukucwaninga nokucwaninga ngokuxoshwa kwamaJalimane aseSudeten ezweni ekupheleni kweMpi Yezwe II. UKřen ekuqaleni wayeyilungu leQembu LamaKhomanisi laseCzechoslovakia kusukela ngo-1949 kuya ku-1969, kodwa waxoshwa ngo-1970 ngenxa yokuphikisana kwakhe ne-  <response>: Ukuhlasela kweSivumelwano SaseWarsaw. Wabuye waxoshwa emsebenzini wakhe njengoprofesa futhi waphoqeleka ukuba asebenze njengomsebenzi wezandla. 