sextr esxtr sxetr xsetr exstr xestr setxr estxr stexr tsexr etsxr tesxr sxter xster stxer tsxer xtser txser extsr xetsr etxsr texsr xtesr txesr sexrt esxrt sxert xsert exsrt xesrt serxt esrxt srext rsext ersxt resxt sxret xsret srxet rsxet xrset rxset exrst xerst erxst rexst xrest rxest setrx estrx sterx tserx etsrx tesrx sertx esrtx sretx rsetx erstx restx strex tsrex srtex rstex trsex rtsex etrsx tersx ertsx retsx tresx rtesx sxtre xstre stxre tsxre xtsre txsre sxrte xsrte srxte rsxte xrste rxste strxe tsrxe srtxe rstxe trsxe rtsxe xtrse txrse xrtse rxtse trxse rtxse extrs xetrs etxrs texrs xters txers exrts xerts erxts rexts xrets rxets etrxs terxs ertxs retxs trexs rtexs xtres txres xrtes rxtes trxes rtxes
Note: these 'words' (valid or invalid) are all the permutations of the word sextr. These words are obtained by scrambling the letters in sextr.