ferpe efrpe frepe rfepe erfpe refpe fepre efpre fpere pfere epfre pefre frpee rfpee fpree pfree rpfee prfee erpfe repfe eprfe perfe rpefe prefe ferep efrep freep rfeep erfep refep feerp eferp feerp eferp eefrp eefrp freep rfeep ferep efrep refep erfep erefp reefp eerfp eerfp reefp erefp feper efper fpeer pfeer epfer pefer feepr efepr feepr efepr eefpr eefpr fpeer pfeer feper efper pefer epfer epefr peefr eepfr eepfr peefr epefr frpee rfpee fpree pfree rpfee prfee frepe rfepe ferpe efrpe refpe erfpe fpere pfere fepre efpre pefre epfre rpefe prefe repfe erpfe perfe eprfe erpef repef epref peref rpeef preef erepf reepf eerpf eerpf reepf erepf eperf peerf eeprf eeprf peerf eperf rpeef preef repef erpef peref epref
Note: these 'words' (valid or invalid) are all the permutations of the word ferpe. These words are obtained by scrambling the letters in ferpe.