thuds htuds tuhds uthds hutds uhtds thdus htdus tdhus dthus hdtus dhtus tudhs utdhs tduhs dtuhs udths duths hudts uhdts hduts dhuts udhts duhts thusd htusd tuhsd uthsd hutsd uhtsd thsud htsud tshud sthud hstud shtud tushd utshd tsuhd stuhd usthd suthd hustd uhstd hsutd shutd ushtd suhtd thdsu htdsu tdhsu dthsu hdtsu dhtsu thsdu htsdu tshdu sthdu hstdu shtdu tdshu dtshu tsdhu stdhu dsthu sdthu hdstu dhstu hsdtu shdtu dshtu sdhtu tudsh utdsh tdush dtush udtsh dutsh tusdh utsdh tsudh studh ustdh sutdh tdsuh dtsuh tsduh stduh dstuh sdtuh udsth dusth usdth sudth dsuth sduth hudst uhdst hdust dhust udhst duhst husdt uhsdt hsudt shudt ushdt suhdt hdsut dhsut hsdut shdut dshut sdhut udsht dusht usdht sudht dsuht sduht
Note: these 'words' (valid or invalid) are all the permutations of the word thuds. These words are obtained by scrambling the letters in thuds.