satdw astdw stadw tsadw atsdw tasdw sadtw asdtw sdatw dsatw adstw dastw stdaw tsdaw sdtaw dstaw tdsaw dtsaw atdsw tadsw adtsw datsw tdasw dtasw satwd astwd stawd tsawd atswd taswd sawtd aswtd swatd wsatd awstd wastd stwad tswad swtad wstad twsad wtsad atwsd tawsd awtsd watsd twasd wtasd sadwt asdwt sdawt dsawt adswt daswt sawdt aswdt swadt wsadt awsdt wasdt sdwat dswat swdat wsdat dwsat wdsat adwst dawst awdst wadst dwast wdast stdwa tsdwa sdtwa dstwa tdswa dtswa stwda tswda swtda wstda twsda wtsda sdwta dswta swdta wsdta dwsta wdsta tdwsa dtwsa twdsa wtdsa dwtsa wdtsa atdws tadws adtws datws tdaws dtaws atwds tawds awtds watds twads wtads adwts dawts awdts wadts dwats wdats tdwas dtwas twdas wtdas dwtas wdtas
Note: these 'words' (valid or invalid) are all the permutations of the word satdw. These words are obtained by scrambling the letters in satdw.