drdao rddao ddrao ddrao rddao drdao drado rdado dardo adrdo raddo arddo ddaro ddaro dadro addro dadro addro rdado drado raddo arddo dardo adrdo drdoa rddoa ddroa ddroa rddoa drdoa droda rdoda dorda odrda rodda ordda ddora ddora dodra oddra dodra oddra rdoda droda rodda ordda dorda odrda draod rdaod darod adrod radod ardod droad rdoad dorad odrad rodad ordad daord adord doard odard aodrd oadrd raodd arodd roadd oradd aordd oardd ddaor ddaor dador addor dador addor ddoar ddoar dodar oddar dodar oddar daodr adodr doadr odadr aoddr oaddr daodr adodr doadr odadr aoddr oaddr rdaod draod radod ardod darod adrod rdoad droad rodad ordad dorad odrad raodd arodd roadd oradd aordd oardd daord adord doard odard aodrd oadrd
Note: these 'words' (valid or invalid) are all the permutations of the word drdao. These words are obtained by scrambling the letters in drdao.