e-i-e-i- epervier everfree ferriere freerein i-ii-iii i-iv-v-i inferrer peeppeep peninver peperine pepperer perierer periperi perrerer pfeiffer pin-fire piperine pipevine pippiree piripiri preferee preferer preppier preripen referree referrer reffrein repreeve repriefe reprieve rerefief rierreef riverine veerenni veneerer verifier verrerie verveine vieirine vineripe viperine viperini vivienne vivifier