perce eprce prece rpece erpce repce pecre epcre pcere cpere ecpre cepre prcee rpcee pcree cpree rcpee crpee ercpe recpe ecrpe cerpe rcepe crepe perec eprec preec rpeec erpec repec peerc eperc peerc eperc eeprc eeprc preec rpeec perec eprec repec erpec erepc reepc eerpc eerpc reepc erepc pecer epcer pceer cpeer ecper ceper peecr epecr peecr epecr eepcr eepcr pceer cpeer pecer epcer ceper ecper ecepr ceepr eecpr eecpr ceepr ecepr prcee rpcee pcree cpree rcpee crpee prece rpece perce eprce repce erpce pcere cpere pecre epcre cepre ecpre rcepe crepe recpe ercpe cerpe ecrpe ercep recep ecrep cerep rceep creep erecp reecp eercp eercp reecp erecp ecerp ceerp eecrp eecrp ceerp ecerp rceep creep recep ercep cerep ecrep
Note: these 'words' (valid or invalid) are all the permutations of the word perce. These words are obtained by scrambling the letters in perce.