fondu ofndu fnodu nfodu onfdu nofdu fodnu ofdnu fdonu dfonu odfnu dofnu fndou nfdou fdnou dfnou ndfou dnfou ondfu nodfu odnfu donfu ndofu dnofu fonud ofnud fnoud nfoud onfud nofud found ofund fuond ufond oufnd uofnd fnuod nfuod funod ufnod nufod unfod onufd noufd ounfd uonfd nuofd unofd fodun ofdun fdoun dfoun odfun dofun foudn ofudn fuodn ufodn oufdn uofdn fduon dfuon fudon ufdon dufon udfon odufn doufn oudfn uodfn duofn udofn fnduo nfduo fdnuo dfnuo ndfuo dnfuo fnudo nfudo fundo ufndo nufdo unfdo fduno dfuno fudno ufdno dufno udfno ndufo dnufo nudfo undfo dunfo udnfo onduf noduf odnuf donuf ndouf dnouf onudf noudf oundf uondf nuodf unodf odunf dounf oudnf uodnf duonf udonf nduof dnuof nudof undof dunof udnof
Note: these 'words' (valid or invalid) are all the permutations of the word fondu. These words are obtained by scrambling the letters in fondu.