flews lfews felws eflws lefws elfws flwes lfwes fwles wfles lwfes wlfes fewls efwls fwels wfels ewfls wefls lewfs elwfs lwefs wlefs ewlfs welfs flesw lfesw felsw eflsw lefsw elfsw flsew lfsew fslew sflew lsfew slfew feslw efslw fselw sfelw esflw seflw lesfw elsfw lsefw slefw eslfw selfw flwse lfwse fwlse wflse lwfse wlfse flswe lfswe fslwe sflwe lsfwe slfwe fwsle wfsle fswle sfwle wsfle swfle lwsfe wlsfe lswfe slwfe wslfe swlfe fewsl efwsl fwesl wfesl ewfsl wefsl feswl efswl fsewl sfewl esfwl sefwl fwsel wfsel fswel sfwel wsfel swfel ewsfl wesfl eswfl sewfl wsefl swefl lewsf elwsf lwesf wlesf ewlsf welsf leswf elswf lsewf slewf eslwf selwf lwsef wlsef lswef slwef wslef swlef ewslf weslf eswlf sewlf wself swelf
Note: these 'words' (valid or invalid) are all the permutations of the word flews. These words are obtained by scrambling the letters in flews.