xdada dxada xadda axdda daxda adxda xddaa dxdaa xddaa dxdaa ddxaa ddxaa xadda axdda xdada dxada adxda daxda dadxa addxa ddaxa ddaxa addxa dadxa xdaad dxaad xadad axdad daxad adxad xdaad dxaad xadad axdad daxad adxad xaadd axadd xaadd axadd aaxdd aaxdd daaxd adaxd daaxd adaxd aadxd aadxd xddaa dxdaa xddaa dxdaa ddxaa ddxaa xdada dxada xadda axdda daxda adxda xdada dxada xadda axdda daxda adxda ddaxa ddaxa dadxa addxa dadxa addxa xadad axdad xdaad dxaad adxad daxad xaadd axadd xaadd axadd aaxdd aaxdd xdaad dxaad xadad axdad daxad adxad adaxd daaxd aadxd aadxd daaxd adaxd dadax addax ddaax ddaax addax dadax daadx adadx daadx adadx aaddx aaddx ddaax ddaax dadax addax dadax addax adadx daadx aaddx aaddx daadx adadx
Note: these 'words' (valid or invalid) are all the permutations of the word xdada. These words are obtained by scrambling the letters in xdada.