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