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