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