duads udads dauds aduds uadds audds dudas uddas dduas dduas uddas dudas dadus addus ddaus ddaus addus dadus uadds audds udads duads aduds dauds duasd udasd dausd adusd uadsd audsd dusad udsad dsuad sduad usdad sudad dasud adsud dsaud sdaud asdud sadud uasdd ausdd usadd suadd asudd saudd dudsa uddsa ddusa ddusa uddsa dudsa dusda udsda dsuda sduda usdda sudda ddsua ddsua dsdua sddua dsdua sddua udsda dusda usdda sudda dsuda sduda dadsu addsu ddasu ddasu addsu dadsu dasdu adsdu dsadu sdadu asddu saddu ddsau ddsau dsdau sddau dsdau sddau adsdu dasdu asddu saddu dsadu sdadu uadsd audsd udasd duasd adusd dausd uasdd ausdd usadd suadd asudd saudd udsad dusad usdad sudad dsuad sduad adsud dasud asdud sadud dsaud sdaud
Note: these 'words' (valid or invalid) are all the permutations of the word duads. These words are obtained by scrambling the letters in duads.