xonn oxnn xnon nxon onxn noxn xonn oxnn xnon nxon onxn noxn xnno nxno xnno nxno nnxo nnxo onnx nonx onnx nonx nnox nnox
Note: these 'words' (valid or invalid) are all the permutations of the word xonn. These words are obtained by scrambling the letters in xonn.