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