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