inrun nirun irnun rinun nriun rniun inurn niurn iunrn uinrn nuirn unirn irunn riunn iurnn uirnn ruinn urinn nruin rnuin nurin unrin runin urnin inrnu nirnu irnnu rinnu nrinu rninu innru ninru innru ninru nniru nniru irnnu rinnu inrnu nirnu rninu nrinu nrniu rnniu nnriu nnriu rnniu nrniu inunr niunr iunnr uinnr nuinr uninr innur ninur innur ninur nniur nniur iunnr uinnr inunr niunr uninr nuinr nunir unnir nnuir nnuir unnir nunir irunn riunn iurnn uirnn ruinn urinn irnun rinun inrun nirun rniun nriun iunrn uinrn inurn niurn unirn nuirn runin urnin rnuin nruin unrin nurin nruni rnuni nurni unrni runni urnni nrnui rnnui nnrui nnrui rnnui nrnui nunri unnri nnuri nnuri unnri nunri runni urnni rnuni nruni unrni nurni
Note: these 'words' (valid or invalid) are all the permutations of the word inrun. These words are obtained by scrambling the letters in inrun.