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