wtand twand watnd awtnd tawnd atwnd wtnad twnad wntad nwtad tnwad ntwad wantd awntd wnatd nwatd anwtd nawtd tanwd atnwd tnawd ntawd antwd natwd wtadn twadn watdn awtdn tawdn atwdn wtdan twdan wdtan dwtan tdwan dtwan wadtn awdtn wdatn dwatn adwtn dawtn tadwn atdwn tdawn dtawn adtwn datwn wtnda twnda wntda nwtda tnwda ntwda wtdna twdna wdtna dwtna tdwna dtwna wndta nwdta wdnta dwnta ndwta dnwta tndwa ntdwa tdnwa dtnwa ndtwa dntwa wandt awndt wnadt nwadt anwdt nawdt wadnt awdnt wdant dwant adwnt dawnt wndat nwdat wdnat dwnat ndwat dnwat andwt nadwt adnwt danwt ndawt dnawt tandw atndw tnadw ntadw antdw natdw tadnw atdnw tdanw dtanw adtnw datnw tndaw ntdaw tdnaw dtnaw ndtaw dntaw andtw nadtw adntw dantw ndatw dnatw
Note: these 'words' (valid or invalid) are all the permutations of the word wtand. These words are obtained by scrambling the letters in wtand.