bbank bbank babnk abbnk babnk abbnk bbnak bbnak bnbak nbbak bnbak nbbak banbk abnbk bnabk nbabk anbbk nabbk banbk abnbk bnabk nbabk anbbk nabbk bbakn bbakn babkn abbkn babkn abbkn bbkan bbkan bkban kbban bkban kbban bakbn abkbn bkabn kbabn akbbn kabbn bakbn abkbn bkabn kbabn akbbn kabbn bbnka bbnka bnbka nbbka bnbka nbbka bbkna bbkna bkbna kbbna bkbna kbbna bnkba nbkba bknba kbnba nkbba knbba bnkba nbkba bknba kbnba nkbba knbba bankb abnkb bnakb nbakb anbkb nabkb baknb abknb bkanb kbanb akbnb kabnb bnkab nbkab bknab kbnab nkbab knbab ankbb nakbb aknbb kanbb nkabb knabb bankb abnkb bnakb nbakb anbkb nabkb baknb abknb bkanb kbanb akbnb kabnb bnkab nbkab bknab kbnab nkbab knbab ankbb nakbb aknbb kanbb nkabb knabb
Note: these 'words' (valid or invalid) are all the permutations of the word bbank. These words are obtained by scrambling the letters in bbank.