bruin rbuin burin ubrin rubin urbin briun rbiun birun ibrun ribun irbun buirn ubirn biurn iburn uibrn iubrn ruibn uribn riubn irubn uirbn iurbn bruni rbuni burni ubrni rubni urbni brnui rbnui bnrui nbrui rnbui nrbui bunri ubnri bnuri nburi unbri nubri runbi urnbi rnubi nrubi unrbi nurbi brinu rbinu birnu ibrnu ribnu irbnu brniu rbniu bnriu nbriu rnbiu nrbiu binru ibnru bniru nbiru inbru nibru rinbu irnbu rnibu nribu inrbu nirbu buinr ubinr biunr ibunr uibnr iubnr bunir ubnir bnuir nbuir unbir nubir binur ibnur bniur nbiur inbur nibur uinbr iunbr unibr nuibr inubr niubr ruinb urinb riunb irunb uirnb iurnb runib urnib rnuib nruib unrib nurib rinub irnub rniub nriub inrub nirub uinrb iunrb unirb nuirb inurb niurb
Note: these 'words' (valid or invalid) are all the permutations of the word bruin. These words are obtained by scrambling the letters in bruin.