koban okban kboan bkoan obkan bokan koabn okabn kaobn akobn oakbn aokbn kbaon bkaon kabon akbon bakon abkon obakn boakn oabkn aobkn baokn abokn kobna okbna kbona bkona obkna bokna konba oknba knoba nkoba onkba nokba kbnoa bknoa knboa nkboa bnkoa nbkoa obnka bonka onbka nobka bnoka nboka koanb okanb kaonb akonb oaknb aoknb konab oknab knoab nkoab onkab nokab kanob aknob knaob nkaob ankob nakob oankb aonkb onakb noakb anokb naokb kbano bkano kabno akbno bakno abkno kbnao bknao knbao nkbao bnkao nbkao kanbo aknbo knabo nkabo ankbo nakbo banko abnko bnako nbako anbko nabko obank boank oabnk aobnk baonk abonk obnak bonak onbak nobak bnoak nboak oanbk aonbk onabk noabk anobk naobk banok abnok bnaok nbaok anbok nabok
Note: these 'words' (valid or invalid) are all the permutations of the word koban. These words are obtained by scrambling the letters in koban.