redri erdri rderi dreri edrri derri rerdi errdi rredi rredi errdi rerdi rdrei drrei rrdei rrdei drrei rdrei edrri derri erdri redri dreri rderi redir erdir rdeir dreir edrir derir reidr eridr riedr iredr eirdr ierdr rdier drier rider irder direr idrer edirr deirr eidrr iedrr dierr iderr rerid errid rreid rreid errid rerid reird erird rierd irerd eirrd ierrd rried rried rired irred rired irred erird reird eirrd ierrd rierd irerd rdrie drrie rrdie rrdie drrie rdrie rdire drire ridre irdre dirre idrre rride rride rirde irrde rirde irrde drire rdire dirre idrre ridre irdre edrir derir erdir redir dreir rdeir edirr deirr eidrr iedrr dierr iderr eridr reidr eirdr ierdr riedr iredr drier rdier direr idrer rider irder
Note: these 'words' (valid or invalid) are all the permutations of the word redri. These words are obtained by scrambling the letters in redri.