teres etres trees rtees ertes retes teers eters teers eters eetrs eetrs trees rtees teres etres retes ertes erets reets eerts eerts reets erets terse etrse trese rtese ertse retse tesre etsre tsere stere estre setre trsee rtsee tsree stree rstee srtee erste reste esrte serte rsete srete teesr etesr teesr etesr eetsr eetsr teser etser tseer steer ester seter teser etser tseer steer ester seter eestr eestr esetr seetr esetr seetr trese rtese terse etrse retse ertse trsee rtsee tsree stree rstee srtee tesre etsre tsere stere estre setre reste erste rsete srete esrte serte erest reest eerst eerst reest erest erset reset esret seret rseet sreet eesrt eesrt esert seert esert seert reset erset rseet sreet esret seret
Note: these 'words' (valid or invalid) are all the permutations of the word teres. These words are obtained by scrambling the letters in teres.