bouyu obuyu buoyu uboyu oubyu uobyu boyuu obyuu byouu ybouu oybuu yobuu buyou ubyou byuou ybuou uybou yubou ouybu uoybu oyubu youbu uyobu yuobu bouuy obuuy buouy ubouy oubuy uobuy bouuy obuuy buouy ubouy oubuy uobuy buuoy ubuoy buuoy ubuoy uuboy uuboy ouuby uouby ouuby uouby uuoby uuoby boyuu obyuu byouu ybouu oybuu yobuu bouyu obuyu buoyu uboyu oubyu uobyu byuou ybuou buyou ubyou yubou uybou oyubu youbu ouybu uoybu yuobu uyobu buyuo ubyuo byuuo ybuuo uybuo yubuo buuyo ubuyo buuyo ubuyo uubyo uubyo byuuo ybuuo buyuo ubyuo yubuo uybuo uyubo yuubo uuybo uuybo yuubo uyubo ouyub uoyub oyuub youub uyoub yuoub ouuyb uouyb ouuyb uouyb uuoyb uuoyb oyuub youub ouyub uoyub yuoub uyoub uyuob yuuob uuyob uuyob yuuob uyuob
Note: these 'words' (valid or invalid) are all the permutations of the word bouyu. These words are obtained by scrambling the letters in bouyu.