silen islen slien lsien ilsen lisen sieln iseln seiln esiln iesln eisln slein lsein selin eslin lesin elsin ilesn liesn ielsn eilsn leisn elisn silne islne sline lsine ilsne lisne sinle isnle snile nsile insle nisle slnie lsnie snlie nslie lnsie nlsie ilnse linse inlse nilse lnise nlise sienl isenl seinl esinl iesnl eisnl sinel isnel sniel nsiel insel nisel senil esnil sneil nseil ensil nesil iensl einsl inesl niesl enisl neisl sleni lseni selni eslni lesni elsni slnei lsnei snlei nslei lnsei nlsei senli esnli sneli nseli ensli nesli lensi elnsi lnesi nlesi enlsi nelsi ilens liens ielns eilns leins elins ilnes lines inles niles lnies nlies ienls einls inels niels enils neils lenis elnis lneis nleis enlis nelis
Note: these 'words' (valid or invalid) are all the permutations of the word silen. These words are obtained by scrambling the letters in silen.