bbbbbb beebee beefer befree beiber berbee berber berere berrer berrie berube beruri beurre bibber bibiri bibiru bieber biribi breefe breere breuer bribe- bribee briber bribir bribri briefe brubru bruree bubber bububu buffer burbur burfee burier burree burrer burrie bururi ebr-ii ebrie eburru eebree eerier effeir effere er-rif erbree euerie febri- feerie feifer feirie ferber ferfer ferier ferrer ferri- ferrie ferrur fibber fieber fiebre fiefie frebie frefre freire freure furber furfie furfur furrer furrfu i-bere i-bure i-free iffier rebuff reefer reeffe refeff refire refrei refurb reiber reueir reuere reuire ribber ribbie ribibe ribier rieber riffer rififi riuere rubbee rubber rubbie rubier rubrie ruffer ruffie rui-be uruffe