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