-er b-u bbb bbc bbe bbl bbr bbt bbu bcb bcc bce bcl bcr bct bcu be- beb bec bee bel ber bet beu blb blc ble bll blr blt blu brb bre brl brr brt bru btb btc bte btl btr btt btu bub buc bue bul bur but buu c-- cbb cbc cbe cbl cbr cbt cbu ccb ccc cce ccl ccr cct ccu ce- ceb cec cee cel cer cet ceu cl- clb clc cle cll clr clt clu crb crc cre crl crr crt cru ctb ctc cte ctl ctr ctt ctu cub cuc cue cul cur cut cuu ebb ebc ebe ebl ebr ebt ebu ec- ecb ecc ece ecl ecr ect ecu eeb eec eee eel eer eet elb elc ele ell elr elt elu erb erc ere erl err ert eru etb etc ete etl etr ett etu eu- eub euc eue eul eur eut lbb lbc lbe lbl lbr lbt lbu lcb lcc lce lcl lcr lct lcu leb lec lee lel ler let leu llb llc lle lll llr llt llu lrb lrc lrr lrt lru ltb ltc lte ltl ltr ltt ltu lub luc lue lul lur lut luu rbb rbc rbe rbl rbr rbt rbu rcb rcc rce rcl rcr rct rcu re- reb rec ree rel rer ret reu rlc rle rll rlr rlt rlu rrb rrc rrl rrr rrt rru rtb rtc rte rtl rtr rtt rtu rub ruc rue rur rut ruu tbb tbc tbe tbl tbr tbt tbu tcb tcc tce tcl tcr tct tcu te- teb tec tee tel ter tet teu tlc tle tll tlr tlt tlu trb trc tre trl trr trt tru ttb ttc tte ttl ttr ttt ttu tub tuc tue tul tur tut tuu ubb ubc ube ubl ubr ubt ubu ucb ucc uce ucl ucr uct ucu ueb uec uee uel uer uet ulb ulc ule ull ulr ult ulu ur- urb urc ure url urr urt uru utb utc ute utl utr utt utu uuc uue uur uut uuu

bbbb bbeb bbet bblb bbrc bcbc bccc bccl bcec bcer bcet bcru bctc bcuc bebb bebe becu beeb beel beer beet bele bell belt belu berc bere berr bert beru betc bete bett betu beur blbt blcu bleb blee blet bleu blrc blub blue blur blut brcb brce breb brec bree brel brer bret brrr brtc bruc brue brut btcc btcl btec btrc btrt bttb bubb bube bubu bucc buce bucu buel buer bueu bulb bule bull bult bulu bur- burb bure burl burr burt buru but- bute butt cbbc cbcc cbce cbcl cbcr cbct cbcu cbec cbee cber cbet cblb cblc cbre cbrl cbrt cbtc cbtl ccbc cccb cccc cccl cccu ccee ccel cclc ccrc ccre ccrl ccrt cctb cctc cctl cctt ccuc ccut cebu cec- cece cect ceeb ceec ceel cel- celc cele cell celt cer- cerc cere cerl cert cet- cete clec clee cler clet cleu cltb cltc club clue clut crbc crbu crcc crce crcr cre- creb crec cree cret creu crrt crtc crtl crub crue crut ctec ctle ctrc ctrl cub- cubb cube cucc cuce cuer culb culc cule cull cult curb cure curl curr curt cut- cutc cute cutt e-cl ebbc ebbr ebcc ebel eber ebru ebul ebur ecbc ecbe eccb eccc ecce eccl ecct eclt ecrc ecrl ecrr ecru ect- ectc eeee eele eerc eetc eete eetu el-b elbe elbu elcb elce elec elee eler elet elle ellu elte elue elul erbb erbe ercc erce ereb erec erel erer eret erle erll errc erre ertl ertu erub eruc erur etbc etbr etcc etec etee etel eter etre ette ettu eubc euer eule eur- eurc eure eurt lbcc lblr lbrt lcbc lccc lcce lcer lcrl lctl le-u lebu lece lect leel leer leet lele lell lelu lerc lere lert lete lett leuc leur llcc llet lleu lllc llll lrrc lrrr ltbl ltcc ltee lttc lttr ltuc lube luce luer lule lull lulu lure lurt lute rbbb rbbr rbcl rble rcbc rccb rccc rcet rcle rctc rebb rebe rebu recc rece recr rect recu reeb reel reet relb rele rell relt rere rert reru rete retr rett reue reul reut reuu rlee rleu rrle rrrr rtcc rtce rtee rtle rtlt rubb rube rubu ruce ruct ruel ruer ruet rule rull rurc rure ruru rute rutl rutt rutu tbcb tbcc tbce tbrb tccc tccu tctc tcul tebu tecl tecr tect teec teel teer teet tel- telc tele tell telt telu ter- terc tere terr teru tete tetr tett tetu teut trcc trcl tre- trec tree tret treu trtc trte trtr trub truc true trut truu ttbb tter tttt ttul tubb tube tubr tubu tucc tuel tuer tuet tule tull tulu turb turc ture turr turt turu tute tutl tutt tutu ubbe uber ubet uble ucbc ucel ucrc ucut uele uell ulbc ulcc uleb ulee ulle ullr ultt ulul urbe ure- uret urle urre urte urur urut utec utel uter uttu uulu uuuu

-tree bbbee bcell be-er bebel beber becel becue becut beebe beele beete beeut belce belec belee belet bellb belle belue belur belut berbe bercu berec berel beret berle berre berru berte betee betel beter betle betre bett- bette betul beuer beule beure beute bleer bleet blere blete bleue bluer bluet blurb blure blurr blurt brebu brece breel breer breet brell brere brett breu- brrrr bruce bruer bruet brule brull brute btc-e btr-t bubbe buber buble bucet bucur buell bulb- bull- bulle bulul bulut burcu burel buret burle burru burte burtt buruc burut butec buter butle butte butut c-tec cblue ccccc ccell ccett ccrcl ccrel cctrl cebec ceber ceele ceere celeb celer cell- celle celte cerbu cerc- cerce cerec cerer ceret cerre certe cette cleer cleet clerc clere clete clett clubb clue- cluer clurr clute clutt crebe crece creel creer crele crell crete cretu creu- creue creul crrel cruce cruel cruet crule crull crure ctree ctrlc cttee ctulu cubbe cubeb cubel cuber cubub culbe culet culle cullu culur curce curel curer curet curle