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