pabnd apbnd pband bpand abpnd bapnd panbd apnbd pnabd npabd anpbd napbd pbnad bpnad pnbad npbad bnpad nbpad abnpd banpd anbpd nabpd bnapd nbapd pabdn apbdn pbadn bpadn abpdn bapdn padbn apdbn pdabn dpabn adpbn dapbn pbdan bpdan pdban dpban bdpan dbpan abdpn badpn adbpn dabpn bdapn dbapn pandb apndb pnadb npadb anpdb napdb padnb apdnb pdanb dpanb adpnb dapnb pndab npdab pdnab dpnab ndpab dnpab andpb nadpb adnpb danpb ndapb dnapb pbnda bpnda pnbda npbda bnpda nbpda pbdna bpdna pdbna dpbna bdpna dbpna pndba npdba pdnba dpnba ndpba dnpba bndpa nbdpa bdnpa dbnpa ndbpa dnbpa abndp bandp anbdp nabdp bnadp nbadp abdnp badnp adbnp dabnp bdanp dbanp andbp nadbp adnbp danbp ndabp dnabp bndap nbdap bdnap dbnap ndbap dnbap
Note: these 'words' (valid or invalid) are all the permutations of the word pabnd. These words are obtained by scrambling the letters in pabnd.