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