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