derro edrro drero rdero erdro redro derro edrro drero rdero erdro redro drreo rdreo drreo rdreo rrdeo rrdeo errdo rerdo errdo rerdo rredo rredo deror edror dreor rdeor erdor redor deorr edorr doerr oderr eodrr oedrr droer rdoer dorer odrer roder order erodr reodr eordr oerdr roedr oredr deror edror dreor rdeor erdor redor deorr edorr doerr oderr eodrr oedrr droer rdoer dorer odrer roder order erodr reodr eordr oerdr roedr oredr drroe rdroe drroe rdroe rrdoe rrdoe drore rdore dorre odrre rodre ordre drore rdore dorre odrre rodre ordre rrode rrode rorde orrde rorde orrde errod rerod errod rerod rreod rreod erord reord eorrd oerrd roerd orerd erord reord eorrd oerrd roerd orerd rroed rroed rored orred rored orred
Note: these 'words' (valid or invalid) are all the permutations of the word derro. These words are obtained by scrambling the letters in derro.