ustrp sutrp utsrp tusrp sturp tsurp usrtp surtp urstp rustp srutp rsutp utrsp tursp urtsp rutsp trusp rtusp strup tsrup srtup rstup trsup rtsup ustpr sutpr utspr tuspr stupr tsupr usptr suptr upstr pustr sputr psutr utpsr tupsr uptsr putsr tpusr ptusr stpur tspur sptur pstur tpsur ptsur usrpt surpt urspt ruspt srupt rsupt usprt suprt upsrt pusrt spurt psurt urpst rupst uprst purst rpust prust srput rsput sprut psrut rpsut prsut utrps turps urtps rutps trups rtups utprs tuprs uptrs putrs tpurs pturs urpts rupts uprts purts rputs pruts trpus rtpus tprus ptrus rptus prtus strpu tsrpu srtpu rstpu trspu rtspu stpru tspru sptru pstru tpsru ptsru srptu rsptu sprtu psrtu rpstu prstu trpsu rtpsu tprsu ptrsu rptsu prtsu
Note: these 'words' (valid or invalid) are all the permutations of the word ustrp. These words are obtained by scrambling the letters in ustrp.