bebeto berber berbet berete berter bertie betere betire bifobi biotit birbir bitbit bitter bittii bitüri bobber bobbio borbet effere efirti erebor eritre erteri ertüre ferfit feribe ferri- ferrit ferro- fetret fitfit fitire iberet ibiret ifteri ittibe oberto otobit retiro robert roboto tefrit tefter terete terter tertor tetere tetire tetiri tifoit tiribe tiroit torero tortor tribo- türefi üreter