sturt tsurt sutrt ustrt tusrt utsrt strut tsrut srtut rstut trsut rtsut surtt usrtt srutt rsutt urstt rustt turst utrst trust rtust urtst rutst stutr tsutr suttr usttr tustr utstr sttur tstur sttur tstur ttsur ttsur suttr usttr stutr tsutr utstr tustr tutsr uttsr ttusr ttusr uttsr tutsr strtu tsrtu srttu rsttu trstu rtstu sttru tstru sttru tstru ttsru ttsru srttu rsttu strtu tsrtu rtstu trstu trtsu rttsu ttrsu ttrsu rttsu trtsu surtt usrtt srutt rsutt urstt rustt sutrt ustrt sturt tsurt utsrt tusrt srtut rstut strut tsrut rtsut trsut urtst rutst utrst turst rtust trust turts utrts truts rtuts urtts rutts tutrs uttrs tturs tturs uttrs tutrs trtus rttus ttrus ttrus rttus trtus urtts rutts utrts turts rtuts truts
Note: these 'words' (valid or invalid) are all the permutations of the word sturt. These words are obtained by scrambling the letters in sturt.