b-reel b-tree bbbbbb beebee beefer beeler beeter beetle befell beflee befree befret belber beleft belett beller bellet beltel belter beltre berbee berber bereel bereet bereft berere berrer berret bertel bertre betell betere betete bettee bettel better bettle bleere blefte brebel breefe breere brette ebbert eberle eebree efeler effere effete efreet efter- elbert eleele ellett erbree errett feeble feeler felber feller felter feltre ferber ferfel ferfer ferrel ferrer ferret fertee ferter fetter fettle fleble fleete fletre freele frefre frelte fretel frette fterer fterre lebert lebret leelee leerer leetle leffel leftbe lefter lerret letter lettre r-tree re-let rebble rebell rebtel reefer reeffe reeler refeel refeet refeff refell refelt refert refete reflee reflet refret refter releef reller rereel reteer reteet retell retere retree retret rettel retter t-tree teebee teetee teeter telefe telele telete telfer tellee teller terete terrel terrer terret terter tertre tetele tetete tetter trbble trebel treble treete trefet trefle trefte tretee trette