smutr msutr sumtr usmtr mustr umstr smtur mstur stmur tsmur mtsur tmsur sutmr ustmr stumr tsumr utsmr tusmr mutsr umtsr mtusr tmusr utmsr tumsr smurt msurt sumrt usmrt musrt umsrt smrut msrut srmut rsmut mrsut rmsut surmt usrmt srumt rsumt ursmt rusmt murst umrst mrust rmust urmst rumst smtru mstru stmru tsmru mtsru tmsru smrtu msrtu srmtu rsmtu mrstu rmstu strmu tsrmu srtmu rstmu trsmu rtsmu mtrsu tmrsu mrtsu rmtsu trmsu rtmsu sutrm ustrm sturm tsurm utsrm tusrm surtm usrtm srutm rsutm urstm rustm strum tsrum srtum rstum trsum rtsum utrsm tursm urtsm rutsm trusm rtusm mutrs umtrs mturs tmurs utmrs tumrs murts umrts mruts rmuts urmts rumts mtrus tmrus mrtus rmtus trmus rtmus utrms turms urtms rutms trums rtums
Note: these 'words' (valid or invalid) are all the permutations of the word smutr. These words are obtained by scrambling the letters in smutr.