iller liler iller liler llier llier ilelr lielr iellr eillr leilr elilr ilelr lielr iellr eillr leilr elilr lleir lleir lelir ellir lelir ellir illre lilre illre lilre llire llire ilrle lirle irlle rille lrile rlile ilrle lirle irlle rille lrile rlile llrie llrie lrlie rllie lrlie rllie ilerl lierl ielrl eilrl leirl elirl ilrel lirel irlel rilel lriel rliel ierll eirll irell riell erill reill leril elril lreil rleil erlil relil ilerl lierl ielrl eilrl leirl elirl ilrel lirel irlel rilel lriel rliel ierll eirll irell riell erill reill leril elril lreil rleil erlil relil lleri lleri lelri ellri lelri ellri llrei llrei lrlei rllei lrlei rllei lerli elrli lreli rleli erlli relli lerli elrli lreli rleli erlli relli
Note: these 'words' (valid or invalid) are all the permutations of the word iller. These words are obtained by scrambling the letters in iller.