durra udrra drura rdura urdra rudra durra udrra drura rdura urdra rudra drrua rdrua drrua rdrua rrdua rrdua urrda rurda urrda rurda rruda rruda durar udrar druar rduar urdar rudar duarr udarr daurr adurr uadrr audrr draur rdaur darur adrur radur ardur uradr ruadr uardr aurdr raudr arudr durar udrar druar rduar urdar rudar duarr udarr daurr adurr uadrr audrr draur rdaur darur adrur radur ardur uradr ruadr uardr aurdr raudr arudr drrau rdrau drrau rdrau rrdau rrdau draru rdaru darru adrru radru ardru draru rdaru darru adrru radru ardru rradu rradu rardu arrdu rardu arrdu urrad rurad urrad rurad rruad rruad urard ruard uarrd aurrd raurd arurd urard ruard uarrd aurrd raurd arurd rraud rraud rarud arrud rarud arrud
Note: these 'words' (valid or invalid) are all the permutations of the word durra. These words are obtained by scrambling the letters in durra.