wfmo fwmo wmfo mwfo fmwo mfwo wfom fwom wofm owfm fowm ofwm wmof mwof womf owmf mowf omwf fmow mfow fomw ofmw mofw omfw
Note: these 'words' (valid or invalid) are all the permutations of the word wfmo. These words are obtained by scrambling the letters in wfmo.