arpen rapen apren paren rpaen praen arepn raepn aerpn earpn reapn erapn apern paern aeprn eaprn pearn eparn rpean prean repan erpan peran epran arpne rapne aprne parne rpane prane arnpe ranpe anrpe narpe rnape nrape apnre panre anpre napre pnare npare rpnae prnae rnpae nrpae pnrae nprae arenp raenp aernp earnp reanp eranp arnep ranep anrep narep rnaep nraep aenrp eanrp anerp naerp enarp nearp renap ernap rneap nreap enrap nerap apenr paenr aepnr eapnr peanr epanr apner paner anper naper pnaer npaer aenpr eanpr anepr naepr enapr neapr penar epnar pnear npear enpar nepar rpena prena repna erpna perna eprna rpnea prnea rnpea nrpea pnrea nprea renpa ernpa rnepa nrepa enrpa nerpa penra epnra pnera npera enpra nepra
Note: these 'words' (valid or invalid) are all the permutations of the word arpen. These words are obtained by scrambling the letters in arpen.