frati rfati farti afrti rafti arfti frtai rftai ftrai tfrai rtfai trfai fatri aftri ftari tfari atfri tafri ratfi artfi rtafi trafi atrfi tarfi frait rfait farit afrit rafit arfit friat rfiat firat ifrat rifat irfat fairt afirt fiart ifart aifrt iafrt raift arift riaft iraft airft iarft frtia rftia ftria tfria rtfia trfia frita rfita firta ifrta rifta irfta ftira tfira fitra iftra tifra itfra rtifa trifa ritfa irtfa tirfa itrfa fatir aftir ftair tfair atfir tafir faitr afitr fiatr ifatr aiftr iaftr ftiar tfiar fitar iftar tifar itfar atifr taifr aitfr iatfr tiafr itafr ratif artif rtaif traif atrif tarif raitf aritf riatf iratf airtf iartf rtiaf triaf ritaf irtaf tiraf itraf atirf tairf aitrf iatrf tiarf itarf
Note: these 'words' (valid or invalid) are all the permutations of the word frati. These words are obtained by scrambling the letters in frati.