dulls udlls dluls lduls uldls ludls dulls udlls dluls lduls uldls ludls dllus ldlus dllus ldlus lldus lldus ullds lulds ullds lulds lluds lluds dulsl udlsl dlusl ldusl uldsl ludsl dusll udsll dsull sdull usdll sudll dlsul ldsul dslul sdlul lsdul sldul ulsdl lusdl usldl suldl lsudl sludl dulsl udlsl dlusl ldusl uldsl ludsl dusll udsll dsull sdull usdll sudll dlsul ldsul dslul sdlul lsdul sldul ulsdl lusdl usldl suldl lsudl sludl dllsu ldlsu dllsu ldlsu lldsu lldsu dlslu ldslu dsllu sdllu lsdlu sldlu dlslu ldslu dsllu sdllu lsdlu sldlu llsdu llsdu lsldu slldu lsldu slldu ullsd lulsd ullsd lulsd llusd llusd ulsld lusld uslld sulld lsuld sluld ulsld lusld uslld sulld lsuld sluld llsud llsud lslud sllud lslud sllud
Note: these 'words' (valid or invalid) are all the permutations of the word dulls. These words are obtained by scrambling the letters in dulls.