serds esrds sreds rseds ersds resds sedrs esdrs sders dsers edsrs desrs srdes rsdes sdres dsres rdses drses erdss redss edrss derss rdess dress sersd esrsd sresd rsesd erssd ressd sesrd essrd sserd sserd essrd sesrd srsed rssed ssred ssred rssed srsed erssd ressd esrsd sersd rsesd sresd sedsr esdsr sdesr dsesr edssr dessr sesdr essdr ssedr ssedr essdr sesdr sdser dsser ssder ssder dsser sdser edssr dessr esdsr sedsr dsesr sdesr srdse rsdse sdrse dsrse rdsse drsse srsde rssde ssrde ssrde rssde srsde sdsre dssre ssdre ssdre dssre sdsre rdsse drsse rsdse srdse dsrse sdrse erdss redss edrss derss rdess dress ersds resds esrds serds rseds sreds edsrs desrs esdrs sedrs dsers sders rdses drses rsdes srdes dsres sdres
Note: these 'words' (valid or invalid) are all the permutations of the word serds. These words are obtained by scrambling the letters in serds.