speir pseir sepir espir pesir epsir spier psier siper isper piser ipser seipr esipr siepr isepr eispr iespr peisr episr piesr ipesr eipsr iepsr speri pseri sepri espri pesri epsri sprei psrei srpei rspei prsei rpsei serpi esrpi srepi rsepi erspi respi persi eprsi presi rpesi erpsi repsi spire psire sipre ispre pisre ipsre sprie psrie srpie rspie prsie rpsie sirpe isrpe sripe rsipe irspe rispe pirse iprse prise rpise irpse ripse seirp esirp sierp iserp eisrp iesrp serip esrip sreip rseip ersip resip sirep isrep sriep rsiep irsep risep eirsp iersp erisp reisp iresp riesp peirs epirs piers ipers eiprs ieprs peris epris preis rpeis erpis repis pires ipres pries rpies irpes ripes eirps ierps erips reips ireps rieps
Note: these 'words' (valid or invalid) are all the permutations of the word speir. These words are obtained by scrambling the letters in speir.