-er bbb bbe bbg bbr bbt bbw be- beb bee beg ber bet bew bgb bge bgg bgr bgt bgw brb bre brg brr brt brw btb bte btg btr btt btw bwb bwg bwr ebb ebe ebg ebr ebt ebw eeb eee eeg eer eet eew egb ege egg egr egt egw erb ere erg err ert erw etb ete etg etr ett etw ewb ewe ewr ewt eww gbe gbg gbr gbt gbw ge- geb gee geg ger get gew ggb ggg ggr ggt ggw grb gre grg grr grt grw gtb gte gtg gtr gtt gtw gwb gwe gwg gwr gwt rbb rbe rbg rbr rbt rbw re- reb ree reg rer ret rew rgb rge rgg rgr rgt rgw rrb rrg rrr rrt rtb rte rtg rtr rtt rtw rwb rwe rwr tbb tbe tbg tbr tbt te- teb tee teg ter tet tew tgb tge tgg tgr tgt trb tre trg trr trt trw ttb tte ttg ttr ttt ttw twb twe twg twr twt tww wbb wbe wbg wbr wbt wbw web wee weg wer wet wew wgb wgr wgt wgw wr- wre wrg wrr wrt wrw wtb wtr wtt wtw wwe wwt www

bbbb bbeb bbet bbrg bbwr bebb bebe beeb beeg beer beet begg bere berg berr bert bete bett betw bewe bgtw breb bree breg brer bret brew brrr brwe btrt bttb ebbr ebbw eber eeee eerg eete egbe egee eger eggb egge egre egte erbb erbe ereb erer eret erew erg- ergg erre erwt etbr etee eter etre ette ewer ewew ewre ewte gbtw gebe geer geet gege gegg gerb gere gert getb gete getg gett gewe ggbt gggg grbr greb gree greg gret grew grrr gtbr gwtw gwwr rbbb rbbr rebb rebe reeb reet rege regr regt rere rerg rert rete retr rett rewe rgbe rgtr rrrr rtee tbrb teer teet tegg tegt ter- tere terr tete tetr tett tre- tree treg tret trew trge trte trtr trwe ttbb tter tttt twbt twee twer wbbb wbbe wbbg wbbr wbbt wbbw wbeb wber wbet wbew wbgb wbge wbgg wbgr wbgt wbgw wbrb wbrg wbrr wbrt wbrw wbte wbtg wbtr wbtt wbtw wbwb wbwt webb webe webg webt weeb weeg weer weet wegb wege wegg wegr wegw wer- werb were werg werr wert werw wetb wete wetr wett wewe wgbb wgbg wgbr wgbt wgbw wgee wger wget wgge wggg wgrb wgre wgrr wgrt wgrw wgtb wgte wgtr wgtt wgwb wgwe wgwg wgww wrbb wrbe wrbg wrbt wrbw wreb wree wrer wret wrew wrgb wrgr wrgw wrrb wrre wrrw wrtb wrte wrtg wrtr wrtw wrwb wrwr wtbb wtbg wtbr wtge wtgg wtgr wtrb wtre wtrg wtrt wtrw wttb wtte wttg wttr wttt wttw wtwb wtwg wtwr wtwt wtww wwbb wwbg wwbr wwbt wweb wweg wwer wwet wwgb wwge wwgr wwrb wwre wwrr wwrw wwtg wwtr wwtw wwwe wwwr wwww

-tree bbbee be-er beber beebe beete begee beget begge berbe bereg beret berge berre berte berwe betee beter betre bett- bette bewer bewet bewte breer breet breg- brege bregg brere brett brewe brrrr btr-t ebber ebbet eberg ebert eeeee egger egret erbbe erber erege erere erewe errew erte erter etete etree etter etwee ewert gberg geber gebet gebre geere geert geete gegge gerbe gerre gertt getee geter gette grebe greer greet grege gregg grete grett grewe grewt grrrr grwge gwere rebbe rebeg reber rebet reege reere reewe reger reget regge regtt rere- reree reret retee reter retew retrg rette rewer rewet tbtbt teber tebet teege tegre teret terge terre tert- teter tetr- tette tewer tewet treer treet treg- trere trete trett trewe ttttt tweeg tweer tweet twere webbe weber webwe weere weert weete weget wegge werbe were- werew werre werte weter wette wrete wrett wwwww

b-tree bbbbbb beebee beegee beeter begger berbee berber bereet berege berere berger berrer berret bertre betere betete bettee better bewter breege breere breger bregge brette brewer brewet ebbert eebree egbere egbert eggert erbree errett etgert ewerer gbegbe gebbet gebert geegee gegger gerber gerege gerger gerret gertte getter getwet greete greger gregge gregre greter grette gteter gwereg gwerre r-tree rebrew regret regrew reteer reteet retere retree retret retter rewere t-tree teebee teetee teeter terete terrer terret terter tertre tetete tetter treete treewe treget tregew tretee trette webber weegee weewee wegert wertew wetere wetter wewere wrette

bbbbbbb beetree begreet berbere bergere bergger bergweg berrett bertree betberg bettger bregger egeberg egrette gebette gee-gee gerbert greetee greeter gregger gregree grgeteg rebberg reeberg regreet reteere reterre retrete rettert retweet terere tergett terreer terrere tettete trebget treetee tregerg trettre tweeter wee-wee wegberg

bbbbbbbb bebetter beerberg begetter berebere bergeret betterer etbetter gerettet greegree re-beget weerberg

beebeebee eggerberg getbetter regretter tebe-tebe terbregge weet-weet weeweewee

beerbrewer bergerette betterbeer

bbbbbbbbbbbbbbb grrrrrrrrrrrrrr