b-tree bbbbbb bebite beebee beegee beeter begbie begger begirt beiber beiger berbee berber bereet berege berere berger bergie berrer berret berrie bertie bertre betere betete betire bettee better bettie bibber biberg bibiri bieber bierge bigbee bigbet bigger biggie biggit bigrig birger birgit biribi biteit bitier bitrig bitter bittie breege breere breger bregge breite brette bribe- bribee briber bribir bribri brigge brigit ebbert ebr-ii ebrie eebree eerier egbere egbert egerie eggert eggier eibert eirigi erbree erebti errett etgert etiger gbegbe gebbet gebbie gebbit gebert geegee gegger geggie geiger gerber gerege gereri gergei gerger gerret gerrie gerrit gertie gertte getter gettie gibber gibbet gibbit gibert gibett gibier gibret gigger gigget giggit gigiri gitige gitter gittie greete greger gregge gregre greige greter grette griebe griege grigri gteter i-bere i-bete i-tree igbere igbeti igeret igetit igreet irrite ittiri r-tree rebbit rebite regeti reggie regret reiber reiter reteer reteet retere retire retree retret retrig retter rettig ribber ribbet ribbie ribbit ribibe ribier rieber rieger rieter riette rietti rigett rigger rigget rititi ritter t-tree tebbit teebee teetee teeter teirei terete teribe terrer terret terrie territ terter tertre tetete tetter tibbit tiber- tibere tiberi tibert tibeti tibiri tibrie tierer tieret tiete tietie tigger tirret tirrit titbit titiri tittee titter tittie treete treget tretee tretie trette tribit triger trigit triibe triigi triter