ugins guins uigns iugns giuns iguns ugnis gunis ungis nugis gnuis nguis uings iungs unigs nuigs inugs niugs ginus ignus gnius ngius ingus nigus ugisn guisn uigsn iugsn giusn igusn ugsin gusin usgin sugin gsuin sguin uisgn iusgn usign suign isugn siugn gisun igsun gsiun sgiun isgun sigun ugnsi gunsi ungsi nugsi gnusi ngusi ugsni gusni usgni sugni gsuni sguni unsgi nusgi usngi sungi nsugi snugi gnsui ngsui gsnui sgnui nsgui sngui uinsg iunsg unisg nuisg inusg niusg uisng iusng using suing isung siung unsig nusig usnig sunig nsuig snuig insug nisug isnug sinug nsiug sniug ginsu ignsu gnisu ngisu ingsu nigsu gisnu igsnu gsinu sginu isgnu signu gnsiu ngsiu gsniu sgniu nsgiu sngiu insgu nisgu isngu singu nsigu snigu
Note: these 'words' (valid or invalid) are all the permutations of the word ugins. These words are obtained by scrambling the letters in ugins.