umsts musts usmts sumts msuts smuts umtss mutss utmss tumss mtuss tmuss ustms sutms utsms tusms stums tsums mstus smtus mtsus tmsus stmus tsmus umsst musst usmst sumst msust smust umsst musst usmst sumst msust smust ussmt susmt ussmt susmt ssumt ssumt mssut smsut mssut smsut ssmut ssmut umtss mutss utmss tumss mtuss tmuss umsts musts usmts sumts msuts smuts utsms tusms ustms sutms tsums stums mtsus tmsus mstus smtus tsmus stmus ustsm sutsm utssm tussm stusm tsusm usstm sustm usstm sustm ssutm ssutm utssm tussm ustsm sutsm tsusm stusm stsum tssum sstum sstum tssum stsum mstsu smtsu mtssu tmssu stmsu tsmsu msstu smstu msstu smstu ssmtu ssmtu mtssu tmssu mstsu smtsu tsmsu stmsu stsmu tssmu sstmu sstmu tssmu stsmu
Note: these 'words' (valid or invalid) are all the permutations of the word umsts. These words are obtained by scrambling the letters in umsts.