trads rtads tards atrds ratds artds trdas rtdas tdras dtras rdtas drtas tadrs atdrs tdars dtars adtrs datrs radts ardts rdats drats adrts darts trasd rtasd tarsd atrsd ratsd artsd trsad rtsad tsrad strad rstad srtad tasrd atsrd tsard stard astrd satrd rastd arstd rsatd sratd asrtd sartd trdsa rtdsa tdrsa dtrsa rdtsa drtsa trsda rtsda tsrda strda rstda srtda tdsra dtsra tsdra stdra dstra sdtra rdsta drsta rsdta srdta dsrta sdrta tadsr atdsr tdasr dtasr adtsr datsr tasdr atsdr tsadr stadr astdr satdr tdsar dtsar tsdar stdar dstar sdtar adstr dastr asdtr sadtr dsatr sdatr radst ardst rdast drast adrst darst rasdt arsdt rsadt sradt asrdt sardt rdsat drsat rsdat srdat dsrat sdrat adsrt dasrt asdrt sadrt dsart sdart
Note: these 'words' (valid or invalid) are all the permutations of the word trads. These words are obtained by scrambling the letters in trads.