pofrn opfrn pforn fporn ofprn foprn porfn oprfn profn rpofn orpfn ropfn pfron fpron prfon rpfon frpon rfpon ofrpn forpn orfpn rofpn fropn rfopn pofnr opfnr pfonr fponr ofpnr fopnr ponfr opnfr pnofr npofr onpfr nopfr pfnor fpnor pnfor npfor fnpor nfpor ofnpr fonpr onfpr nofpr fnopr nfopr pornf oprnf pronf rponf orpnf ropnf ponrf opnrf pnorf nporf onprf noprf prnof rpnof pnrof nprof rnpof nrpof ornpf ronpf onrpf norpf rnopf nropf pfrno fprno prfno rpfno frpno rfpno pfnro fpnro pnfro npfro fnpro nfpro prnfo rpnfo pnrfo nprfo rnpfo nrpfo frnpo rfnpo fnrpo nfrpo rnfpo nrfpo ofrnp fornp orfnp rofnp fronp rfonp ofnrp fonrp onfrp nofrp fnorp nforp ornfp ronfp onrfp norfp rnofp nrofp frnop rfnop fnrop nfrop rnfop nrfop
Note: these 'words' (valid or invalid) are all the permutations of the word pofrn. These words are obtained by scrambling the letters in pofrn.