droll rdoll dorll odrll rodll ordll drlol rdlol dlrol ldrol rldol lrdol dolrl odlrl dlorl ldorl oldrl lodrl roldl orldl rlodl lrodl olrdl lordl droll rdoll dorll odrll rodll ordll drlol rdlol dlrol ldrol rldol lrdol dolrl odlrl dlorl ldorl oldrl lodrl roldl orldl rlodl lrodl olrdl lordl drllo rdllo dlrlo ldrlo rldlo lrdlo drllo rdllo dlrlo ldrlo rldlo lrdlo dllro ldlro dllro ldlro lldro lldro rlldo lrldo rlldo lrldo llrdo llrdo dollr odllr dlolr ldolr oldlr lodlr dollr odllr dlolr ldolr oldlr lodlr dllor ldlor dllor ldlor lldor lldor olldr loldr olldr loldr llodr llodr rolld orlld rlold lrold olrld lorld rolld orlld rlold lrold olrld lorld rllod lrlod rllod lrlod llrod llrod ollrd lolrd ollrd lolrd llord llord
Note: these 'words' (valid or invalid) are all the permutations of the word droll. These words are obtained by scrambling the letters in droll.