duing uding diung idung uidng iudng dunig udnig dnuig nduig undig nudig dinug idnug dniug ndiug indug nidug uindg iundg unidg nuidg inudg niudg duign udign diugn idugn uidgn iudgn dugin udgin dguin gduin ugdin gudin digun idgun dgiun gdiun igdun gidun uigdn iugdn ugidn guidn igudn giudn dungi udngi dnugi ndugi undgi nudgi dugni udgni dguni gduni ugdni gudni dngui ndgui dgnui gdnui ngdui gndui ungdi nugdi ugndi gundi ngudi gnudi dingu idngu dnigu ndigu indgu nidgu dignu idgnu dginu gdinu igdnu gidnu dngiu ndgiu dgniu gdniu ngdiu gndiu ingdu nigdu igndu gindu ngidu gnidu uingd iungd unigd nuigd inugd niugd uignd iugnd ugind guind igund giund ungid nugid ugnid gunid nguid gnuid ingud nigud ignud ginud ngiud gniud
Note: these 'words' (valid or invalid) are all the permutations of the word duing. These words are obtained by scrambling the letters in duing.