zirn izrn zrin rzin irzn rizn zinr iznr znir nzir inzr nizr zrni rzni znri nzri rnzi nrzi irnz rinz inrz nirz rniz nriz
Note: these 'words' (valid or invalid) are all the permutations of the word zirn. These words are obtained by scrambling the letters in zirn.