xedp exdp xdep dxep edxp dexp xepd expd xped pxed epxd pexd xdpe dxpe xpde pxde dpxe pdxe edpx depx epdx pedx dpex pdex
Note: these 'words' (valid or invalid) are all the permutations of the word xedp. These words are obtained by scrambling the letters in xedp.