petre eptre ptere tpere etpre tepre perte eprte prete rpete erpte repte ptree tpree prtee rptee trpee rtpee etrpe terpe ertpe retpe trepe rtepe peter epter pteer tpeer etper teper peetr epetr peetr epetr eeptr eeptr pteer tpeer peter epter teper etper etepr teepr eetpr eetpr teepr etepr peret epret preet rpeet erpet repet peert epert peert epert eeprt eeprt preet rpeet peret epret repet erpet erept reept eerpt eerpt reept erept ptree tpree prtee rptee trpee rtpee ptere tpere petre eptre tepre etpre prete rpete perte eprte repte erpte trepe rtepe terpe etrpe retpe ertpe etrep terep ertep retep treep rteep eterp teerp eetrp eetrp teerp eterp eretp reetp eertp eertp reetp eretp treep rteep terep etrep retep ertep
Note: these 'words' (valid or invalid) are all the permutations of the word petre. These words are obtained by scrambling the letters in petre.