arsbn rasbn asrbn sarbn rsabn srabn arbsn rabsn abrsn barsn rbasn brasn asbrn sabrn absrn basrn sbarn bsarn rsban srban rbsan brsan sbran bsran arsnb rasnb asrnb sarnb rsanb sranb arnsb ransb anrsb narsb rnasb nrasb asnrb sanrb ansrb nasrb snarb nsarb rsnab srnab rnsab nrsab snrab nsrab arbns rabns abrns barns rbans brans arnbs ranbs anrbs narbs rnabs nrabs abnrs banrs anbrs nabrs bnars nbars rbnas brnas rnbas nrbas bnras nbras asbnr sabnr absnr basnr sbanr bsanr asnbr sanbr ansbr nasbr snabr nsabr abnsr bansr anbsr nabsr bnasr nbasr sbnar bsnar snbar nsbar bnsar nbsar rsbna srbna rbsna brsna sbrna bsrna rsnba srnba rnsba nrsba snrba nsrba rbnsa brnsa rnbsa nrbsa bnrsa nbrsa sbnra bsnra snbra nsbra bnsra nbsra
Note: these 'words' (valid or invalid) are all the permutations of the word arsbn. These words are obtained by scrambling the letters in arsbn.