drour rdour dorur odrur rodur ordur druor rduor duror udror rudor urdor dourr odurr duorr udorr oudrr uodrr roudr orudr ruodr urodr ourdr uordr droru rdoru dorru odrru rodru ordru drrou rdrou drrou rdrou rrdou rrdou dorru odrru droru rdoru ordru rodru rordu orrdu rrodu rrodu orrdu rordu druro rduro durro udrro rudro urdro drruo rdruo drruo rdruo rrduo rrduo durro udrro druro rduro urdro rudro rurdo urrdo rrudo rrudo urrdo rurdo dourr odurr duorr udorr oudrr uodrr dorur odrur drour rdour ordur rodur duror udror druor rduor urdor rudor ourdr uordr orudr roudr urodr ruodr rourd orurd ruord urord ourrd uorrd rorud orrud rroud rroud orrud rorud rurod urrod rruod rruod urrod rurod ourrd uorrd orurd rourd urord ruord
Note: these 'words' (valid or invalid) are all the permutations of the word drour. These words are obtained by scrambling the letters in drour.