beins ebins biens ibens eibns iebns benis ebnis bneis nbeis enbis nebis bines ibnes bnies nbies inbes nibes einbs ienbs enibs neibs inebs niebs beisn ebisn biesn ibesn eibsn iebsn besin ebsin bsein sbein esbin sebin bisen ibsen bsien sbien isben siben eisbn iesbn esibn seibn isebn siebn bensi ebnsi bnesi nbesi enbsi nebsi besni ebsni bseni sbeni esbni sebni bnsei nbsei bsnei sbnei nsbei snbei ensbi nesbi esnbi senbi nsebi snebi binse ibnse bnise nbise inbse nibse bisne ibsne bsine sbine isbne sibne bnsie nbsie bsnie sbnie nsbie snbie insbe nisbe isnbe sinbe nsibe snibe einsb iensb enisb neisb inesb niesb eisnb iesnb esinb seinb isenb sienb ensib nesib esnib senib nseib sneib inseb niseb isneb sineb nsieb snieb
Note: these 'words' (valid or invalid) are all the permutations of the word beins. These words are obtained by scrambling the letters in beins.