-er -th bbb bbc bbe bbg bbh bbr bbt bcb bcc bce bcg bch bcr bct be- beb bec bee beg beh ber bet bgb bgc bge bgg bgh bgr bgt bhb bhc bhe bhg bhh bhr bht brb bre brg brh brr brt btb btc bte btg bth btr btt c-- cbb cbc cbe cbg cbh cbr cbt ccb ccc cce ccg cch ccr cct ce- ceb cec cee ceg ceh cer cet cgb cgc cge cgg cgh cgr cgt ch- chb chc che chg chh chr cht crb crc cre crg crh crr crt ctb ctc cte ctg cth ctr ctt ebb ebc ebe ebg ebh ebr ebt ec- ecb ecc ece ecg ech ecr ect eeb eec eee eeg eer eet egb egc ege egg egh egr egt ehb ehc ehe ehg ehh ehr eht erb erc ere erg erh err ert etb etc ete etg eth etr ett gbc gbe gbg gbh gbr gbt gcb gcc gce gcg gch gcr gct ge- geb gec gee geg geh ger get ggb ggc ggg ggh ggr ggt ghb ghc ghe ghg ghh ghr ght grb grc gre grg grh grr grt gtb gtc gte gtg gth gtr gtt hbb hbc hbe hbg hbh hbr hbt hcb hcc hce hcg hch hcr hct he- heb hec hee heg heh her het hgb hgc hge hgg hgh hgr hgt hhb hhc hhe hhg hhh hhr hht hr- hrb hrc hre hrg hrh hrr hrt htb htc hte htg hth htr htt rbb rbc rbe rbg rbh rbr rbt rcb rcc rce rcg rch rcr rct re- reb rec ree reg reh rer ret rgb rgc rge rgg rgh rgr rgt rh- rhb rhc rhe rhg rhh rhr rht rrb rrc rrg rrh rrr rrt rtb rtc rte rtg rtr rtt tbb tbc tbe tbg tbh tbr tbt tcb tcc tce tcg tch tcr tct te- teb tec tee teg teh ter tet tgb tgc tge tgg tgh tgr tgt th- thb thc the thg thh thr tht trb trc tre trg trh trr trt ttb ttc tte ttg tth ttr ttt

bbbb bbch bbeb bbet bbrc bbrg bcbc bcbg bccc bcec bcer bcet bche bctc bebb bebe bech beeb beeg beer beet begg behr berc bere berg berr bert betc bete beth bett bght bhcc bher bhet bhrt brcb brce breb brec bree breg brer bret brrr brtc btcc btec btrc btrt bttb cbbc cbcc cbce cbcr cbct cbec cbee cber cbet cbgb cbre cbrh cbrt cbtc ccbc cccb cccc ccee ccgc ccgt cche cchr ccrc ccre ccrg ccrt cctb cctc cctt cec- cece cect ceeb ceec cege cer- cerc cere cert cet- cete cgcc cgcg cger chce chch cheb chec chee cheh cher chet chgb chge chrb chrc chrr chrt chtr chtt crbc crcc crce crcr cre- creb crec cree creg creh cret crrt crtc ctec ctge ctrc ebbc ebbr ebcc eber ecbc ecbe eccb eccc ecce ecct eche echt ecrc ecrr ect- ectc ecth eeee eerc eerg eetc eete eeth egbe egcc egcg egcr egec egee eger eggb egge eggh eghe eghh egre egte ehcc eheh eher ehre ehte erbb erbe ercc erce erch ereb erec erer eret erg- ergg ergh erhc errc erre erth etbc etbr etcc etch etec etee eter eth- ethe etre ette gc-c gcbc gccc gcet gcrg gctc gebe gece geer geet gege gegg geht gerb gere gert getb gete getg geth gett ggbt gggg gghg ghee gheg grbr grcc grce greb grec gree greg gret grrr grtc gtbr gtcr hcbc hccb hccc hcch hcgh hebb hebe hebr hech hect heeb heeg heer heet hege hegg hegh hehe herb herc here herg herr hert hete heth hett hggc hgtc hhgg hhhh hree hrrc hrtb hrte htcc htet httr rbbb rbbr rbgh rcbc rccb rccc rcet rcgc rchb rcrg rctc rctg rebb rebe recc rece rech recr rect reeb reet rege regr regt rehb rehe reht rere rerg rert rete reth retr rett rgbe rgtr rhbg rhce rhcg rheb rhee rhet rrrr rtcc rtce rtcg rtee tbcb tbcc tbce tbrb tccc tch- tche tchh tchr tctc tech tecr tect teec teer teet tegg tegh tegt tehr ter- terc tere terr tete teth tetr tett tgcc tgtc thch the- theb thec thee ther thet thre thtb thtr trcc tre- trec tree treg tret trge trtc trte trtr ttbb tter tttt

-tree bbbee be-er beber beche beebe beech beete beeth begee beget begge beher behet berbe berec bereg bereh beret berge bergh berhe berre berte berth betch betee beter bethe betre bett- bette bheer bhtec brece brech breer breet breg- brege bregg brere breth brett brrrr btc-e btech btr-t c-tec ccccc ccett cebec ceber cech ceche cecht ceere cegge cerc- cerce cerec cerer ceret cerge cerre certe cette chech cheer cheet chege chegg chehr chere chert chete cheth chett chher crebe crece creer cregg crete ctree cttee ebber ebbet eberg ebert echte ecthr eeeee eetch egger egret ehret erbbe erber erceg erech erect erege erere erte erter erthe etche etete ether etree etter gberg geber gebet gebre gee-h geech geere geert geete gegge gehee gerbe gerce gerre gerth gertt getee geter gethe gette gheet grebe grece grech greer greet grege gregg grete greth grett grrrr gtech h-e-b he-he hebbe hebe- heber heche hecht hect- hecte heegh heere heete heger hegge heght hehte herce hereg herre herte herth hetch heter hethe hette hgttg hheth hhhhh hrere hthrt htree rebbe rebec rebeg reber rebet recce recet reche recht rect- recte reece reech reege reere reerh reeth regec reger reget regge regtt reher rehet rere- reree reret retch retee reter rethe retrg rette rhett tbtbt teber tebet tecch teche tectb teech teege teeth teght tegre tehee terce teret terge terre tert- tetch teter tethe tetr- tette thebe thec- thect theeb theer thegh thegr ther- there thete theth thre- three thret treer treet treg- trere trete trett ttttt

b-tree bbbbbb becher bechet beebee beegee beeter begec begger behete behter berbee berber berche bereet berege berere berger berhet berrer berret berthe bertre