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