serpc esrpc srepc rsepc erspc respc seprc esprc sperc pserc epsrc pesrc srpec rspec sprec psrec rpsec prsec erpsc repsc eprsc persc rpesc presc sercp esrcp srecp rsecp erscp rescp secrp escrp scerp cserp ecsrp cesrp srcep rscep screp csrep rcsep crsep ercsp recsp ecrsp cersp rcesp cresp sepcr espcr specr psecr epscr pescr secpr escpr scepr csepr ecspr cespr spcer pscer scper csper pcser cpser epcsr pecsr ecpsr cepsr pcesr cpesr srpce rspce sprce psrce rpsce prsce srcpe rscpe scrpe csrpe rcspe crspe spcre pscre scpre cspre pcsre cpsre rpcse prcse rcpse crpse pcrse cprse erpcs repcs eprcs percs rpecs precs ercps recps ecrps cerps rceps creps epcrs pecrs ecprs ceprs pcers cpers rpces prces rcpes crpes pcres cpres
Note: these 'words' (valid or invalid) are all the permutations of the word serpc. These words are obtained by scrambling the letters in serpc.