-er bbb bbc bbe bbo bbr bbt bcb bcc bce bco bcr bct bcv be- beb bec bee beo ber bet bev bob boc boe boo bor bot bov brb bre bro brr brt brv btb btc bte bto btr btt btv bvb bvc bve bvo bvr bvt bvv c-- cbb cbc cbe cbo cbr cbt cbv ccb ccc cce cco ccr cct ccv ce- ceb cec cee ceo cer cet cev co- cob coc coe coo cor cot cov crb crc cre cro crr crt crv ctb ctc cte cto ctr ctt ctv cvb cvc cve cvo cvr cvt cvv ebb ebc ebe ebo ebr ebt ebv ec- ecb ecc ece eco ecr ect ecv eeb eec eee eeo eer eet eev eo- eob eoc eoe eoo eor eot erb erc ere ero err ert erv etb etc ete eto etr ett etv evb evc eve evo evr evt evv ob- obb obc obe obo obr obt obv oc- ocb occ oco ocr oct ocv oeb oec oee oeo oer oet oo- oob ooc ooo oor oot oov or- orb orc ore oro orr ort orv ot- otb otc ote oto otr ott otv ov- ovb ovc ove ovo ovv rbb rbc rbe rbo rbr rbt rcb rcc rce rco rcr rct rcv re- reb rec ree reo rer ret rev rob roc roe roo ror rot rov rrb rrc rrr rrt rtb rtc rte rto rtr rtt rtv rvb rvc rve rvo rvr rvt rvv tbb tbc tbe tbo tbr tbt tbv tcb tcc tce tco tcr tct tcv te- teb tec tee teo ter tet tev to- tob toc toe too tor tot tov trb trc tre tro trr trt trv ttb ttc tte tto ttr ttt ttv tvb tvc tve tvo tvr tvt v-e vbc vbo vbr vbv vcc vce vco vcr vct veb vec vee veo ver vet vob voc voe voo vor vot vov vrb vrc vre vrr vrt vtb vtc vte vto vtr vtt vtv vvb vvc vvo vvr vvt vvv

bbbb bbeb bbet bbrc bcbc bccc bcec bcer bcet bcor bctc bcvo bebb bebe bebo beeb beer beet beo- beor beot berc bere bero berr bert betc bete beto bett betv bevo bobb bobe bobo boce boco boec boee boeo boer boet boob booc booe boor boot bor- bore boro borr bort botb bote boto bott bove bovo brcb brce breb brec bree breo brer bret brev brob broc broe broo bror brot brrr brtc btcc btec btob btor btrc btrt bttb c-bo cbbc cbcc cbce cbcr cbct cbec cbee cber cbet cbot cbre cbrt cbtc cbtv cbvb cbve cbvr ccbc cccb cccc cccv ccee ccob ccoc ccrc ccre ccrt cctb cctc cctt cctv ccvo cec- cece ceco cect ceeb ceec ceor cer- cerc cere cero cert cet- cete ceto cetv cevo cobb cobe cobo coce coco coct coob coot cor- corb corc core coro corr cort cotb cotc cote coto cott cove covo crbc crcc crce crcr cre- creb crec cree creo cret crob croc croe croo cror crot crrt crtc crtv ctec ctor ctot ctrc ctvo ctvt cvcc cver cvet cvrr cvte ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ecbc ecbe eccb eccc ecce ecco ecct eco- ecot ecrc ecrr ecrv ect- ectc ecto ectv eeee eeoc eerc eero eetc eete eore eotc eoto erbb erbe ercc erce ereb erec erer eret erev erob eroc eroe eroo errc erre erro erve etbc etbr etcc etco etec etee eter etoe etre etro ette etto etvo ever evet evoe evoo evre o-eo obbo obec ober obet oboe obor obot obre obro ocbc occc occt oce ocee ocet ocre ocro ocrr oct- octe octo oec- oecc oeec oere oobe oocr ooer oooo oore oort ootb orbb orbe orbo orce orco ore- oreb orec oreo orer oro- oroe oror orot orro ortc orte orto orve orvr otee oter oto- otoe otoo otor otov otre otro otte otto ovee over ovet ovo- ovoo ovot ovre rbbb rbbr rcbc rcbo rccb rccc rcet rctc rctv rcvr rebb rebe rebo recc rece recr rect reeb reet reev reot rere rero rert rete reto retr rett reve revo rob- robb robe robo robt rocc roce roco roer roet roev roob roor root rorc rore roro rort rotc rote roto rotr rott rove rovo rrrr rtcc rtce rtee rtve rv-c rver tbcb tbcc tbce tbrb tccc tcov tctc tebo teco tecr tect teec teer teet teev teor ter- terc tere tero terr tete teto tetr tett tobe tobo tobt toce toco toee toer toet toor toot torc tore toro torr tort torv totc tote toto totr tott tove tovo trcc tre- trec tree treo tret trev troc troe troo trot trtc trte trtr ttbb tteo tter ttoe tttt tver tvro tvrr tvtv vbcc vecc veer veet veor ver- verb vere vero vert vete veto vetr veve vevo voce voer voet vooc voor voot vor- vore voro vort vote voto vreo vret vroc vrot vrto vtec vver vvob vvvv

-tree bbbee bbctv be-er be-ro beber bebot becco becov beebe beete beeve beote berbe berec beret berob beroe beror berre berte berto betee beter betoo betor betre bett- bette betto bevce bever bevor bo-bo bobet boboc bobov bobr bobre bocce bocet bocor boece boero booce booco booer boore boort borbo borce borec boree borer boret boro- boroo borot borov borre borro borve borvo botet botev botro botte bovec bovee brece breer breet breo- breoc brere breto brett breve brobo broce broer broto brrrr btc-e btr-t c-cor c-evo c-tec ccccc ccctv ccett cebec ceber ceco- ceere ceoce ceoor cerc- cerce cerco cerec cerer ceret cero- ceroc cerre cerro certe cervo ceto- cette co-bo co-co cobbe cobot cobre cocc- cocce cocco coceo cocto coete coeve cooee cooer coore coote corbe corbo corce core- coree corer coro- corot corre corte corto cortv corve corvo coter cott- cotte cotto coveo cover covet crebe crece creer creo- creot crete creve croce croco crooe croot crore crote crott crove ctree cttee cvrce ebber ebbet ebert