upste puste uspte supte psute spute uptse putse utpse tupse ptuse tpuse ustpe sutpe utspe tuspe stupe tsupe pstue sptue ptsue tpsue stpue tspue upset puset uspet supet psuet spuet upest puest uepst eupst peust epust usept suept uespt euspt seupt esupt pseut speut pesut epsut seput esput uptes putes utpes tupes ptues tpues upets puets uepts eupts peuts eputs uteps tueps uetps eutps teups etups pteus tpeus petus eptus tepus etpus ustep sutep utsep tusep stuep tsuep usetp suetp uestp eustp seutp esutp utesp tuesp uetsp eutsp teusp etusp steup tseup setup estup tesup etsup psteu spteu ptseu tpseu stpeu tspeu psetu spetu pestu epstu septu esptu ptesu tpesu petsu eptsu tepsu etpsu stepu tsepu setpu estpu tespu etspu
Note: these 'words' (valid or invalid) are all the permutations of the word upste. These words are obtained by scrambling the letters in upste.