guck ugck gcuk cguk ucgk cugk gukc ugkc gkuc kguc ukgc kugc gcku cgku gkcu kgcu ckgu kcgu uckg cukg ukcg kucg ckug kcug
Note: these 'words' (valid or invalid) are all the permutations of the word guck. These words are obtained by scrambling the letters in guck.