nixy inxy nxiy xniy ixny xiny niyx inyx nyix ynix iynx yinx nxyi xnyi nyxi ynxi xyni yxni ixyn xiyn iyxn yixn xyin yxin
Note: these 'words' (valid or invalid) are all the permutations of the word nixy. These words are obtained by scrambling the letters in nixy.