twain wtain tawin atwin watin awtin twian wtian tiwan itwan witan iwtan taiwn atiwn tiawn itawn aitwn iatwn waitn awitn wiatn iwatn aiwtn iawtn twani wtani tawni atwni watni awtni twnai wtnai tnwai ntwai wntai nwtai tanwi atnwi tnawi ntawi antwi natwi wanti awnti wnati nwati anwti nawti twina wtina tiwna itwna witna iwtna twnia wtnia tnwia ntwia wntia nwtia tinwa itnwa tniwa ntiwa intwa nitwa winta iwnta wnita nwita inwta niwta tainw atinw tianw itanw aitnw iatnw taniw atniw tnaiw ntaiw antiw natiw tinaw itnaw tniaw ntiaw intaw nitaw aintw iantw anitw naitw inatw niatw waint awint wiant iwant aiwnt iawnt wanit awnit wnait nwait anwit nawit winat iwnat wniat nwiat inwat niwat ainwt ianwt aniwt naiwt inawt niawt
Note: these 'words' (valid or invalid) are all the permutations of the word twain. These words are obtained by scrambling the letters in twain.