berko ebrko breko rbeko erbko rebko bekro ebkro bkero kbero ekbro kebro brkeo rbkeo bkreo kbreo rkbeo krbeo erkbo rekbo ekrbo kerbo rkebo krebo berok ebrok breok rbeok erbok rebok beork ebork boerk oberk eobrk oebrk broek rboek borek obrek robek orbek erobk reobk eorbk oerbk roebk orebk bekor ebkor bkeor kbeor ekbor kebor beokr ebokr boekr obekr eobkr oebkr bkoer kboer boker obker kober okber ekobr keobr eokbr oekbr koebr okebr brkoe rbkoe bkroe kbroe rkboe krboe broke rboke borke obrke robke orbke bkore kbore bokre obkre kobre okbre rkobe krobe rokbe orkbe korbe okrbe erkob rekob ekrob kerob rkeob kreob erokb reokb eorkb oerkb roekb orekb ekorb keorb eokrb oekrb koerb okerb rkoeb kroeb rokeb orkeb koreb okreb
Note: these 'words' (valid or invalid) are all the permutations of the word berko. These words are obtained by scrambling the letters in berko.