renin ernin rnein nrein enrin nerin reinn erinn rienn irenn eirnn iernn rnien nrien rinen irnen niren inren enirn neirn einrn ienrn niern inern renni ernni rneni nreni enrni nerni renni ernni rneni nreni enrni nerni rnnei nrnei rnnei nrnei nnrei nnrei ennri nenri ennri nenri nneri nneri reinn erinn rienn irenn eirnn iernn renin ernin rnein nrein enrin nerin rinen irnen rnien nrien inren niren einrn ienrn enirn neirn inern niern rnine nrine rinne irnne nirne inrne rnnie nrnie rnnie nrnie nnrie nnrie rinne irnne rnine nrine inrne nirne ninre innre nnire nnire innre ninre eninr neinr einnr iennr nienr inenr ennir nenir ennir nenir nneir nneir einnr iennr eninr neinr inenr nienr niner inner nnier nnier inner niner
Note: these 'words' (valid or invalid) are all the permutations of the word renin. These words are obtained by scrambling the letters in renin.