draff rdaff darff adrff radff ardff drfaf rdfaf dfraf fdraf rfdaf frdaf dafrf adfrf dfarf fdarf afdrf fadrf rafdf arfdf rfadf fradf afrdf fardf draff rdaff darff adrff radff ardff drfaf rdfaf dfraf fdraf rfdaf frdaf dafrf adfrf dfarf fdarf afdrf fadrf rafdf arfdf rfadf fradf afrdf fardf drffa rdffa dfrfa fdrfa rfdfa frdfa drffa rdffa dfrfa fdrfa rfdfa frdfa dffra fdfra dffra fdfra ffdra ffdra rffda frfda rffda frfda ffrda ffrda daffr adffr dfafr fdafr afdfr fadfr daffr adffr dfafr fdafr afdfr fadfr dffar fdfar dffar fdfar ffdar ffdar affdr fafdr affdr fafdr ffadr ffadr raffd arffd rfafd frafd afrfd farfd raffd arffd rfafd frafd afrfd farfd rffad frfad rffad frfad ffrad ffrad affrd fafrd affrd fafrd ffard ffard
Note: these 'words' (valid or invalid) are all the permutations of the word draff. These words are obtained by scrambling the letters in draff.