ymmw mymw ymmw mymw mmyw mmyw ymwm mywm ywmm wymm mwym wmym ymwm mywm ywmm wymm mwym wmym mmwy mmwy mwmy wmmy mwmy wmmy
Note: these 'words' (valid or invalid) are all the permutations of the word ymmw. These words are obtained by scrambling the letters in ymmw.