syrens ysrens sryens rsyens yrsens rysens syerns yserns seyrns esyrns yesrns eysrns sreyns rseyns seryns esryns resyns ersyns yresns ryesns yersns eyrsns reysns erysns syrnes ysrnes srynes rsynes yrsnes rysnes synres ysnres snyres nsyres ynsres nysres srnyes rsnyes snryes nsryes rnsyes nrsyes yrnses rynses ynrses nyrses rnyses nryses syenrs ysenrs seynrs esynrs yesnrs eysnrs syners ysners snyers nsyers ynsers nysers senyrs esnyrs sneyrs nseyrs ensyrs nesyrs yensrs eynsrs ynesrs nyesrs enysrs neysrs srenys rsenys sernys esrnys resnys ersnys srneys rsneys snreys nsreys rnseys nrseys senrys esnrys snerys nserys ensrys nesrys rensys ernsys rnesys nresys enrsys nersys yrenss ryenss yernss eyrnss reynss erynss yrness ryness ynress nyress rnyess nryess yenrss eynrss ynerss nyerss enyrss neyrss renyss ernyss rneyss nreyss enryss neryss syresn ysresn sryesn rsyesn yrsesn rysesn syersn ysersn seyrsn esyrsn yesrsn eysrsn sreysn rseysn serysn esrysn resysn ersysn yressn ryessn yerssn eyrssn reyssn eryssn syrsen ysrsen srysen rsysen yrssen ryssen sysren yssren ssyren ssyren yssren sysren srsyen rssyen ssryen ssryen rssyen srsyen yrssen ryssen ysrsen syrsen rsysen srysen syesrn ysesrn seysrn esysrn yessrn eyssrn sysern yssern ssyern ssyern yssern sysern sesyrn essyrn sseyrn sseyrn essyrn sesyrn yessrn eyssrn ysesrn syesrn esysrn seysrn sresyn rsesyn sersyn esrsyn ressyn erssyn srseyn rsseyn ssreyn ssreyn rsseyn srseyn sesryn essryn sseryn sseryn essryn sesryn ressyn erssyn rsesyn sresyn esrsyn sersyn yressn ryessn yerssn eyrssn reyssn eryssn yrsesn rysesn ysresn syresn rsyesn sryesn yesrsn eysrsn ysersn syersn esyrsn seyrsn resysn ersysn rseysn sreysn esrysn serysn syrnse ysrnse srynse rsynse yrsnse rysnse synrse ysnrse snyrse nsyrse ynsrse nysrse srnyse rsnyse snryse nsryse rnsyse nrsyse yrnsse rynsse ynrsse nyrsse rnysse nrysse syrsne ysrsne srysne rsysne yrssne ryssne sysrne yssrne ssyrne ssyrne yssrne sysrne srsyne rssyne ssryne ssryne rssyne srsyne yrssne ryssne ysrsne syrsne rsysne srysne synsre ysnsre snysre nsysre ynssre nyssre sysnre yssnre ssynre ssynre yssnre sysnre snsyre nssyre ssnyre ssnyre nssyre snsyre ynssre nyssre ysnsre synsre nsysre snysre srnsye rsnsye snrsye nsrsye rnssye nrssye srsnye rssnye ssrnye ssrnye rssnye srsnye snsrye nssrye ssnrye ssnrye nssrye snsrye rnssye nrssye rsnsye srnsye nsrsye snrsye yrnsse rynsse ynrsse nyrsse rnysse nrysse yrsnse rysnse ysrnse syrnse rsynse srynse ynsrse nysrse ysnrse synrse nsyrse snyrse rnsyse nrsyse rsnyse srnyse nsryse snryse syensr ysensr seynsr esynsr yesnsr eysnsr synesr ysnesr snyesr nsyesr ynsesr nysesr senysr esnysr sneysr nseysr ensysr nesysr yenssr eynssr ynessr nyessr enyssr neyssr syesnr ysesnr seysnr esysnr yessnr eyssnr sysenr yssenr ssyenr ssyenr yssenr sysenr sesynr essynr sseynr sseynr essynr sesynr yessnr eyssnr ysesnr syesnr esysnr seysnr synser ysnser snyser nsyser ynsser nysser sysner yssner ssyner ssyner yssner sysner snsyer nssyer ssnyer ssnyer nssyer snsyer ynsser nysser ysnser synser nsyser snyser sensyr esnsyr snesyr nsesyr enssyr nessyr sesnyr essnyr ssenyr ssenyr essnyr sesnyr snseyr nsseyr ssneyr ssneyr nsseyr snseyr enssyr nessyr esnsyr sensyr nsesyr snesyr yenssr eynssr ynessr nyessr enyssr neyssr yesnsr eysnsr ysensr syensr esynsr seynsr ynsesr nysesr ysnesr synesr nsyesr snyesr ensysr nesysr esnysr senysr nseysr sneysr srensy rsensy sernsy esrnsy resnsy ersnsy srnesy rsnesy snresy nsresy rnsesy nrsesy senrsy esnrsy snersy nsersy ensrsy nesrsy renssy ernssy rnessy nressy enrssy nerssy sresny rsesny sersny esrsny ressny erssny srseny rsseny ssreny ssreny rsseny srseny sesrny essrny sserny sserny essrny sesrny ressny erssny rsesny sresny esrsny sersny srnsey rsnsey snrsey nsrsey rnssey nrssey srsney rssney ssrney ssrney rssney srsney snsrey nssrey ssnrey ssnrey nssrey snsrey rnssey nrssey rsnsey srnsey nsrsey snrsey sensry esnsry snesry nsesry enssry nessry sesnry essnry ssenry ssenry essnry sesnry snsery nssery ssnery ssnery nssery snsery enssry nessry esnsry sensry nsesry snesry renssy ernssy rnessy nressy enrssy nerssy resnsy ersnsy rsensy srensy esrnsy sernsy rnsesy nrsesy rsnesy srnesy nsresy snresy ensrsy nesrsy esnrsy senrsy nsersy snersy yrenss ryenss yernss eyrnss reynss erynss yrness ryness ynress nyress rnyess nryess yenrss eynrss ynerss nyerss enyrss neyrss renyss ernyss rneyss nreyss enryss neryss yresns ryesns yersns eyrsns reysns erysns yrsens rysens ysrens syrens rsyens sryens yesrns eysrns yserns syerns esyrns seyrns resyns ersyns rseyns sreyns esryns seryns yrnses rynses ynrses nyrses rnyses nryses yrsnes rysnes ysrnes syrnes rsynes srynes ynsres nysres ysnres synres nsyres snyres rnsyes nrsyes rsnyes srnyes nsryes snryes yensrs eynsrs ynesrs nyesrs enysrs neysrs yesnrs eysnrs ysenrs syenrs esynrs seynrs ynsers nysers ysners syners nsyers snyers ensyrs nesyrs esnyrs senyrs nseyrs sneyrs rensys ernsys rnesys nresys enrsys nersys resnys ersnys rsenys srenys esrnys sernys rnseys nrseys rsneys srneys nsreys snreys ensrys nesrys esnrys senrys nserys snerys
Note: these 'words' (valid or invalid) are all the permutations of the word syrens. These words are obtained by scrambling the letters in syrens.