dunch udnch dnuch nduch undch nudch ducnh udcnh dcunh cdunh ucdnh cudnh dncuh ndcuh dcnuh cdnuh ncduh cnduh uncdh nucdh ucndh cundh ncudh cnudh dunhc udnhc dnuhc nduhc undhc nudhc duhnc udhnc dhunc hdunc uhdnc hudnc dnhuc ndhuc dhnuc hdnuc nhduc hnduc unhdc nuhdc uhndc hundc nhudc hnudc duchn udchn dcuhn cduhn ucdhn cudhn duhcn udhcn dhucn hducn uhdcn hudcn dchun cdhun dhcun hdcun chdun hcdun uchdn cuhdn uhcdn hucdn chudn hcudn dnchu ndchu dcnhu cdnhu ncdhu cndhu dnhcu ndhcu dhncu hdncu nhdcu hndcu dchnu cdhnu dhcnu hdcnu chdnu hcdnu nchdu cnhdu nhcdu hncdu chndu hcndu unchd nuchd ucnhd cunhd ncuhd cnuhd unhcd nuhcd uhncd huncd nhucd hnucd uchnd cuhnd uhcnd hucnd chund hcund nchud cnhud nhcud hncud chnud hcnud
Note: these 'words' (valid or invalid) are all the permutations of the word dunch. These words are obtained by scrambling the letters in dunch.