shtum hstum sthum tshum htsum thsum shutm hsutm suhtm ushtm hustm uhstm stuhm tsuhm suthm usthm tushm utshm htusm thusm hutsm uhtsm tuhsm uthsm shtmu hstmu sthmu tshmu htsmu thsmu shmtu hsmtu smhtu mshtu hmstu mhstu stmhu tsmhu smthu msthu tmshu mtshu htmsu thmsu hmtsu mhtsu tmhsu mthsu shumt hsumt suhmt ushmt husmt uhsmt shmut hsmut smhut mshut hmsut mhsut sumht usmht smuht msuht umsht musht humst uhmst hmust mhust umhst muhst stumh tsumh sutmh ustmh tusmh utsmh stmuh tsmuh smtuh mstuh tmsuh mtsuh sumth usmth smuth msuth umsth musth tumsh utmsh tmush mtush umtsh mutsh htums thums hutms uhtms tuhms uthms htmus thmus hmtus mhtus tmhus mthus humts uhmts hmuts mhuts umhts muhts tumhs utmhs tmuhs mtuhs umths muths
Note: these 'words' (valid or invalid) are all the permutations of the word shtum. These words are obtained by scrambling the letters in shtum.