braks rbaks barks abrks rabks arbks brkas rbkas bkras kbras rkbas krbas bakrs abkrs bkars kbars akbrs kabrs rakbs arkbs rkabs krabs akrbs karbs brask rbask barsk abrsk rabsk arbsk brsak rbsak bsrak sbrak rsbak srbak basrk absrk bsark sbark asbrk sabrk rasbk arsbk rsabk srabk asrbk sarbk brksa rbksa bkrsa kbrsa rkbsa krbsa brska rbska bsrka sbrka rsbka srbka bksra kbsra bskra sbkra ksbra skbra rksba krsba rskba srkba ksrba skrba baksr abksr bkasr kbasr akbsr kabsr baskr abskr bsakr sbakr asbkr sabkr bksar kbsar bskar sbkar ksbar skbar aksbr kasbr askbr sakbr ksabr skabr raksb arksb rkasb krasb akrsb karsb raskb arskb rsakb srakb asrkb sarkb rksab krsab rskab srkab ksrab skrab aksrb kasrb askrb sakrb ksarb skarb
Note: these 'words' (valid or invalid) are all the permutations of the word braks. These words are obtained by scrambling the letters in braks.