flack lfack falck aflck lafck alfck flcak lfcak fclak cflak lcfak clfak faclk afclk fcalk cfalk acflk caflk lacfk alcfk lcafk clafk aclfk calfk flakc lfakc falkc aflkc lafkc alfkc flkac lfkac fklac kflac lkfac klfac faklc afklc fkalc kfalc akflc kaflc lakfc alkfc lkafc klafc aklfc kalfc flcka lfcka fclka cflka lcfka clfka flkca lfkca fklca kflca lkfca klfca fckla cfkla fkcla kfcla ckfla kcfla lckfa clkfa lkcfa klcfa cklfa kclfa fackl afckl fcakl cfakl acfkl cafkl fakcl afkcl fkacl kfacl akfcl kafcl fckal cfkal fkcal kfcal ckfal kcfal ackfl cakfl akcfl kacfl ckafl kcafl lackf alckf lcakf clakf aclkf calkf lakcf alkcf lkacf klacf aklcf kalcf lckaf clkaf lkcaf klcaf cklaf kclaf acklf caklf akclf kaclf ckalf kcalf
Note: these 'words' (valid or invalid) are all the permutations of the word flack. These words are obtained by scrambling the letters in flack.