totr tott towe towh tre- tree tref treo tret trew trfr troe troo trot trow trte trtr trwe ttbb tteo tter ttff ttoe tttt twbt twee twer two- twob twof twoh twoo twot wbbb wbbe wbbf wbbo wbbr wbbt wbbw wbeb wber wbet wbew wbfb wbfe wbff wbfh wbfo wbfr wbft wbfw wbhb wbhf wbhh wbhr wbht wbhw wbob wbor wbow wbrb wbrf wbrh wbrr wbrt wbrw wbte wbtf wbth wbto wbtr wbtt wbtw wbwb wbwo wbwt webb webe webf webo webt weeb weef weeo weer weet wefe weff wefr weft wehh wehr weht weow wer- werb were werf werh wero werr wert werw wetb wete wetf weth weto wetr wett wewe wewo wfbe wfbf wfbr wfbt wfeb wfer wfff wffh wfhb wfhr wfht wfob wfor wfot wfrb wfre wfrf wfrh wfro wfrw wfte wftf wfth wftr wftw wfwo whbb whbe whbf whbo whbr whbt wheb whee whef wheo wher whet whew whfb whfh whfr whfw whhb whhh whho whhr whht whhw whoe whof whoo whor whot whow whr- whrb whre whrf whrh whro whrw whtb whtf whth whto whtt whwb whwh wobb wobe wobo wobt woer wofe woff wofr woft wohe wohf woht woob woof woot woow worb wore worf woro worr wort worw wotb wote woth wotr wott wotw wowb wowe wowf wowo wowt woww wrbb wrbe wrbf wrbh wrbo wrbt wrbw wreb wree wreh wrer wret wrew wrfb wrfe wrff wrft wrfw wrho wrht wrob wroo wrot wrow wrrb wrre wrrh wrro wrrw wrtb wrte wrth wrto wrtr wrtw wrwb wrwh wrwr wtbb wtbf wtbh wtbo wtbr wthb wthe wthr wtht wtob wtoe wtof wtoh wtor wtot wtow wtrb wtre wtrh wtro wtrt wtrw wttb wtte wttf wtth wtto wttr wttt wttw wtwb wtwf wtwo wtwr wtwt wtww wwbb wwbf wwbr wwbt wweb wweo wwer wwet wwfe wwfr wwfw wwhb wwho wwhr wwht wwof wwor wwot wwow wwrb wwre wwrf wwrr wwrw wwtf wwth wwtr wwtw wwwe wwwh wwwr wwww

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b-tree bbbbbb bebeto beebee beefer beeter before befree befret behefe beheft behete behofe behoft behoof behoot behote behror behter berbee berbeo berber bereet bereft berere berhet beroth berowe berrer berret berrow berthe bertre betere betete bethor betrow bettee better bettor bewoor bewter bo-hoo bobber bobete bobote bobowo bobrow boeber boerre bofete boffet bohero boober booboo booher boohoe boohoo bootee booter boothe borbor boreth boreto borewe borfee borore bororo borowe borowo