sexm esxm sxem xsem exsm xesm semx esmx smex msex emsx mesx sxme xsme smxe msxe xmse mxse exms xems emxs mexs xmes mxes
Note: these 'words' (valid or invalid) are all the permutations of the word sexm. These words are obtained by scrambling the letters in sexm.