-er -th bbb bbe bbh bbk bbr bbt be- beb bee beh bek ber bet bev bhb bhe bhh bhk bhr bht bhv bkb bke bkk bkr bkt bkv brb bre brh brk brr brt brv btb bte bth btk btr btt btv bvb bve bvh bvk bvr bvt bvv ebb ebe ebh ebk ebr ebt ebv eeb eee eek eer eet eev ehb ehe ehh ehr eht ehv ekb eke ekh ekr ekt ekv erb ere erh erk err ert erv etb ete eth etk etr ett etv evb eve evh evr evt evv hbb hbe hbh hbk hbr hbt hbv he- heb hee heh hek her het hev hhb hhe hhh hhk hhr hht hhv hkb hkh hkk hkr hkt hr- hrb hre hrh hrk hrr hrt hrv htb hte hth htk htr htt htv hv- hvb hvk hvr hvt hvv k-t kbb kbe kbh kbk kbr ke- keb kee keh kek ker ket kev khe khh khk khr khv kkb kke kkh kkk kkr kkt kkv krk krr krt krv ktb kte kth ktk ktr ktt ktv kvb kvh kvk kvr kvv rbb rbe rbh rbk rbr rbt re- reb ree reh rek rer ret rev rh- rhb rhe rhh rhr rht rhv rkb rke rkk rkt rkv rrb rrh rrk rrr rrt rtb rte rtk rtr rtt rtv rvb rve rvh rvr rvt rvv tbb tbe tbh tbk tbr tbt tbv te- teb tee teh tek ter tet tev th- thb the thh thk thr tht thv tkb tke tkk tkr tkt trb tre trh trk trr trt trv ttb tte tth ttk ttr ttt ttv tvb tve tvh tvk tvr tvt v-e vbh vbk vbr vbv veb vee veh vek ver vet vh- vhb vhe vht vkb vkt vrb vre vrh vrk vrr vrt vtb vte vtk vtr vtt vtv vvb vvr vvt vvv

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-tree b-r-k bbbee be-er bebek beber beebe beeke beete beeth beeve beher behet beker bekke berbe bereh berek beret berhe berk- berke berre berte berth betee beter bethe betke betre bett- bette bever bevke bheer bhev breek breer breet breke brere breth brett breve brrrr btr-t ebber ebbet ebert eeeee eevee eever eheke ehret ekker erbbe erber erere ereve erte erter erthe eteke etete ether etree etrek etter evere everr evert evete evett eveve evtek h-e-b he-he hebbe hebe- heber heere heete hehte heker hekk- hekte herek herke herre herte herth herve hetek heter hethe hette hever hheth hhhhh hrbek hrere hthrt htree k-t-b kebbe kebek keber keere keeve kehek kehte kerek keret kerre kerve ketek keter kethe kette kever kheer kheth kreek kreke krete rebbe reber rebet reere reerh reeth reeve reher rehet rekke rere- reree reret retee reter rethe rette rever revet rhett rt-rk rtrev t-v-h tbtbt teber tebet teeth tehee teket tekke terek teret terre tert- terve teter tethe tetr- tette tevet thebe theeb theek theer theke ther- there therk thete theth theve thre- three thret tkkev treer treet trere trete trett treve ttttt veber vebre veere veeve vekke vekre vereb verek verke verre verte verve vette vever vrhek

b-tree bbbbbb beebee beeker beeter beever behete behter bekker berbee berber bereet bereke berere berhet berker berrer berret berthe bertre betere betete bethke bettee better breere breeth brekke brethe brette brever brevet bthree ebbert ebbeth eebree erbree erreth errett erveth ethere ethete everte hebete heebee heehee heeter hehehe hehheh herber herbet hereke herher herter herthe heter- hether hetter k-tree kebber keeker keever kehrer kerber kerker kertee kerteh kerver kether ketter khrber kreker kretek r-tree reeker reever rehber rehete reteer reteet retere rether retree retret retter reverb revere revert revver rheeve t-tree te-hee tebeth teebee teehee teerth teetee teeter teethe teevee tekkeh terete terrer terret terter tertre tetete tethee tether tetteh tetter tevere teveth theeve thekte therev thetee thethe