syren ysren sryen rsyen yrsen rysen syern ysern seyrn esyrn yesrn eysrn sreyn rseyn seryn esryn resyn ersyn yresn ryesn yersn eyrsn reysn erysn syrne ysrne sryne rsyne yrsne rysne synre ysnre snyre nsyre ynsre nysre srnye rsnye snrye nsrye rnsye nrsye yrnse rynse ynrse nyrse rnyse nryse syenr ysenr seynr esynr yesnr eysnr syner ysner snyer nsyer ynser nyser senyr esnyr sneyr nseyr ensyr nesyr yensr eynsr ynesr nyesr enysr neysr sreny rseny serny esrny resny ersny srney rsney snrey nsrey rnsey nrsey senry esnry snery nsery ensry nesry rensy ernsy rnesy nresy enrsy nersy yrens ryens yerns eyrns reyns eryns yrnes rynes ynres nyres rnyes nryes yenrs eynrs yners nyers enyrs neyrs renys ernys rneys nreys enrys nerys
Note: these 'words' (valid or invalid) are all the permutations of the word syren. These words are obtained by scrambling the letters in syren.