grinb rginb girnb igrnb rignb irgnb grnib rgnib gnrib ngrib rngib nrgib ginrb ignrb gnirb ngirb ingrb nigrb ringb irngb rnigb nrigb inrgb nirgb gribn rgibn girbn igrbn rigbn irgbn grbin rgbin gbrin bgrin rbgin brgin gibrn igbrn gbirn bgirn ibgrn bigrn ribgn irbgn rbign brign ibrgn birgn grnbi rgnbi gnrbi ngrbi rngbi nrgbi grbni rgbni gbrni bgrni rbgni brgni gnbri ngbri gbnri bgnri nbgri bngri rnbgi nrbgi rbngi brngi nbrgi bnrgi ginbr ignbr gnibr ngibr ingbr nigbr gibnr igbnr gbinr bginr ibgnr bignr gnbir ngbir gbnir bgnir nbgir bngir inbgr nibgr ibngr bingr nbigr bnigr rinbg irnbg rnibg nribg inrbg nirbg ribng irbng rbing bring ibrng birng rnbig nrbig rbnig brnig nbrig bnrig inbrg nibrg ibnrg binrg nbirg bnirg
Note: these 'words' (valid or invalid) are all the permutations of the word grinb. These words are obtained by scrambling the letters in grinb.