bbbbbb beebee beefer beever befree beiber berbee berber berere beriev berrer berrie bervie bevier bibber bibiri bieber biribi biverb bivver breefe breere breive brever brevi- bribe- bribee briber bribir bribri briefe brieve ebr-ii ebrie eebree eerier effeir effere eivere er-rif erbree everie febri- febvre feerie feifer feirie ferber ferfer ferier ferrer ferri- ferrie fibber fieber fiebre fiefie fiverr frebie frefre freire i-bere i-free ifever iffier iriver reefer reeffe reever refeff refire refrei reiber reiver reveir reverb revere revier revire revive revver ribber ribbie ribibe ribier rieber riever riffer rififi riveir rivier veerer veibri verevi verier verree verrei verrer verrie verver veveri vibrer vivere vivier vvvvvv