birle ibrle brile rbile irble rible bilre iblre blire lbire ilbre libre brlie rblie blrie lbrie rlbie lrbie irlbe rilbe ilrbe lirbe rlibe lribe birel ibrel briel rbiel irbel ribel bierl iberl beirl ebirl iebrl eibrl breil rbeil beril ebril rebil erbil irebl riebl ierbl eirbl reibl eribl biler ibler blier lbier ilber liber bielr ibelr beilr ebilr ieblr eiblr bleir lbeir belir eblir lebir elbir ilebr liebr ielbr eilbr leibr elibr brlei rblei blrei lbrei rlbei lrbei breli rbeli berli ebrli rebli erbli bleri lberi belri eblri lebri elbri rlebi lrebi relbi erlbi lerbi elrbi irleb rileb ilreb lireb rlieb lrieb irelb rielb ierlb eirlb reilb erilb ilerb lierb ielrb eilrb leirb elirb rleib lreib relib erlib lerib elrib
Note: these 'words' (valid or invalid) are all the permutations of the word birle. These words are obtained by scrambling the letters in birle.