onxx noxx oxnx xonx nxox xnox onxx noxx oxnx xonx nxox xnox oxxn xoxn oxxn xoxn xxon xxon nxxo xnxo nxxo xnxo xxno xxno
Note: these 'words' (valid or invalid) are all the permutations of the word onxx. These words are obtained by scrambling the letters in onxx.