rafts arfts rfats frats afrts farts ratfs artfs rtafs trafs atrfs tarfs rftas frtas rtfas trfas ftras tfras aftrs fatrs atfrs tafrs ftars tfars rafst arfst rfast frast afrst farst rasft arsft rsaft sraft asrft sarft rfsat frsat rsfat srfat fsrat sfrat afsrt fasrt asfrt safrt fsart sfart ratsf artsf rtasf trasf atrsf tarsf rastf arstf rsatf sratf asrtf sartf rtsaf trsaf rstaf srtaf tsraf straf atsrf tasrf astrf satrf tsarf starf rftsa frtsa rtfsa trfsa ftrsa tfrsa rfsta frsta rsfta srfta fsrta sfrta rtsfa trsfa rstfa srtfa tsrfa strfa ftsra tfsra fstra sftra tsfra stfra aftsr fatsr atfsr tafsr ftasr tfasr afstr fastr asftr saftr fsatr sfatr atsfr tasfr astfr satfr tsafr stafr ftsar tfsar fstar sftar tsfar stfar
Note: these 'words' (valid or invalid) are all the permutations of the word rafts. These words are obtained by scrambling the letters in rafts.