myxo ymxo mxyo xmyo yxmo xymo myox ymox moyx omyx yomx oymx mxoy xmoy moxy omxy xomy oxmy yxom xyom yoxm oyxm xoym oxym
Note: these 'words' (valid or invalid) are all the permutations of the word myxo. These words are obtained by scrambling the letters in myxo.