uxrd xurd urxd ruxd xrud rxud uxdr xudr udxr duxr xdur dxur urdx rudx udrx durx rdux drux xrdu rxdu xdru dxru rdxu drxu
Note: these 'words' (valid or invalid) are all the permutations of the word uxrd. These words are obtained by scrambling the letters in uxrd.