ugisd guisd uigsd iugsd giusd igusd ugsid gusid usgid sugid gsuid sguid uisgd iusgd usigd suigd isugd siugd gisud igsud gsiud sgiud isgud sigud ugids guids uigds iugds giuds iguds ugdis gudis udgis dugis gduis dguis uidgs iudgs udigs duigs idugs diugs gidus igdus gdius dgius idgus digus ugsdi gusdi usgdi sugdi gsudi sgudi ugdsi gudsi udgsi dugsi gdusi dgusi usdgi sudgi udsgi dusgi sdugi dsugi gsdui sgdui gdsui dgsui sdgui dsgui uisdg iusdg usidg suidg isudg siudg uidsg iudsg udisg duisg idusg diusg usdig sudig udsig dusig sduig dsuig isdug sidug idsug disug sdiug dsiug gisdu igsdu gsidu sgidu isgdu sigdu gidsu igdsu gdisu dgisu idgsu digsu gsdiu sgdiu gdsiu dgsiu sdgiu dsgiu isdgu sidgu idsgu disgu sdigu dsigu
Note: these 'words' (valid or invalid) are all the permutations of the word ugisd. These words are obtained by scrambling the letters in ugisd.