triff rtiff tirff itrff ritff irtff trfif rtfif tfrif ftrif rftif frtif tifrf itfrf tfirf ftirf iftrf fitrf riftf irftf rfitf fritf ifrtf firtf triff rtiff tirff itrff ritff irtff trfif rtfif tfrif ftrif rftif frtif tifrf itfrf tfirf ftirf iftrf fitrf riftf irftf rfitf fritf ifrtf firtf trffi rtffi tfrfi ftrfi rftfi frtfi trffi rtffi tfrfi ftrfi rftfi frtfi tffri ftfri tffri ftfri fftri fftri rffti frfti rffti frfti ffrti ffrti tiffr itffr tfifr ftifr iftfr fitfr tiffr itffr tfifr ftifr iftfr fitfr tffir ftfir tffir ftfir fftir fftir ifftr fiftr ifftr fiftr ffitr ffitr rifft irfft rfift frift ifrft firft rifft irfft rfift frift ifrft firft rffit frfit rffit frfit ffrit ffrit iffrt fifrt iffrt fifrt ffirt ffirt
Note: these 'words' (valid or invalid) are all the permutations of the word triff. These words are obtained by scrambling the letters in triff.