wrens rwens werns ewrns rewns erwns wrnes rwnes wnres nwres rnwes nrwes wenrs ewnrs wners nwers enwrs newrs renws ernws rnews nrews enrws nerws wresn rwesn wersn ewrsn rewsn erwsn wrsen rwsen wsren swren rswen srwen wesrn ewsrn wsern swern eswrn sewrn reswn erswn rsewn srewn esrwn serwn wrnse rwnse wnrse nwrse rnwse nrwse wrsne rwsne wsrne swrne rswne srwne wnsre nwsre wsnre swnre nswre snwre rnswe nrswe rsnwe srnwe nsrwe snrwe wensr ewnsr wnesr nwesr enwsr newsr wesnr ewsnr wsenr swenr eswnr sewnr wnser nwser wsner swner nswer snwer enswr neswr esnwr senwr nsewr snewr rensw ernsw rnesw nresw enrsw nersw resnw ersnw rsenw srenw esrnw sernw rnsew nrsew rsnew srnew nsrew snrew ensrw nesrw esnrw senrw nserw snerw
Note: these 'words' (valid or invalid) are all the permutations of the word wrens. These words are obtained by scrambling the letters in wrens.