-er -ic b-u bbb bbc bbe bbi bbr bbt bbu bcb bcc bce bci bcr bct bcu be- beb bec bee bei ber bet beu bi- bib bic bie bii bir bit biu brb bre bri brr brt bru btb btc bte bti btr btt btu bub buc bue bui bur but buu c-- cbb cbc cbe cbi cbr cbt cbu ccb ccc cce cci ccr cct ccu ce- ceb cec cee cei cer cet ceu ci- cib cic cie cii cir cit ciu crb crc cre cri crr crt cru ctb ctc cte cti ctr ctt ctu cub cuc cue cui cur cut cuu ebb ebc ebe ebi ebr ebt ebu ec- ecb ecc ece eci ecr ect ecu eeb eec eee eer eet eib eic eie eii eir eit eiu erb erc ere eri err ert eru etb etc ete eti etr ett etu eu- eub euc eue eui eur eut ibb ibc ibe ibi ibr ibt ibu icb icc ice ici icr ict icu ie- iec iee iei ier iet iib iic iie iii iir iit iiu ir- irb irc ire iri irr irt iru itb itc ite iti itt itu iu- iub iuc iue iui iur iut rbb rbc rbe rbi rbr rbt rbu rcb rcc rce rci rcr rct rcu re- reb rec ree rei rer ret reu rib ric rie rii rir rit rrb rrc rri rrr rrt rru rtb rtc rte rti rtr rtt rtu rub ruc rue rui rur rut ruu tbb tbc tbe tbi tbr tbt tbu tcb tcc tce tci tcr tct tcu te- teb tec tee tei ter tet teu tib tic tie tii tir tit tiu trb trc tre tri trr trt tru ttb ttc tte tti ttr ttt ttu tub tuc tue tui tur tut tuu ubb ubc ube ubi ubr ubt ubu ucb ucc uce uci ucr uct ucu ueb uec uee uei uer uet uib uic uie uii uir uit uiu ur- urb urc ure uri urr urt uru utb utc ute uti utr utt utu uuc uue uur uut uuu

bbbb bbci bbeb bbet bbrc bcbc bccc bcci bcec bcer bcet bcie bcit bcru bctc bcuc bebb bebe bebi beci becu beeb beer beet beic beir beit berc bere beri berr bert beru betc bete beti bett betu beur bibb bibe bibi bicc bice bici bieb bier biet bieu birb bire biri birr birt biru bitc bite bitt bitu brcb brce breb brec bree brei brer bret bric brie brit brrr brtc bruc brue brut btcc btec btie btrc btrt bttb bubb bube bubi bubu bucc buce buci bucu buer bueu buic buie buir buit buiu bur- burb bure buri burr burt buru but- bute buti butt cbbc cbcc cbce cbcr cbct cbcu cbec cbee cber cbet cbir cbit cbre cbrt cbtc ccbc cccb cccc ccci cccu ccee ccic ccii ccir ccrc ccre ccri ccrt cctb cctc cctt ccuc ccut cebu cec- cece ceci cect ceeb ceec cer- cerc cere ceri cert cet- cete ceti ceui cibc cibe cibi cicc cici cicr cict cicu ciee cier ciii ciit cirb circ cire ciri cirr cirt citb cite citi citt citu ciuc crbc crbu crcc crce crcr cre- creb crec cree crei cret creu crib cric crie crit criu crrt crtc crub crue crut ctbi ctec ctic ctrc cub- cubb cube cubi cucc cuce cuci cuer cui- cuir cuit curb cure curi curr curt cut- cutc cute cutt ebbc ebbr ebcc eber ebic ebit ebru ebur ecbc ecbe eccb eccc ecce ecci ecct ecib ecit ecrc ecri ecrr ecru ect- ectc eeee eerc eetc eete eetu eiec eiei eier eire eitb eitc eiti eitr erbb erbe ercc erce ereb erec erei erer eret eric erie erit eriu errc erre ertu erub eruc erur etbc etbr etcc etec etee eter etic etre ette etti ettu etui eubc eubi euer eur- eurc eure eurt i-be ibec ibet ibie ibrc ibri ibtb ibtc icbc iccb iccc icci iccr icct iccu icec icee icer icet icrc icre icrr icrt icru icub icue iecc ieet ieie iere ieri iett iiie iiii iiit iirc iitr iitt iiuc irbe ircc ircu iree irer iri- iric irie irrc irre irri irte irti itbe itec iter itet itic itie itri itur iucc iuce iuiu rbbb rbbr rcbc rccb rccc rcet rcic rctc rcti rebb rebe rebu recc rece reci recr rect recu reeb reet reii reir reit reiu rere reri rert reru rete reti retr rett reue reut reuu rib- ribe ribu ricc rice rict rier riet rieu rire riri rite riti ritt ritu riue rrrr rtcc rtce rtee rtei rubb rube rubi rubu ruce ruci ruct ruer ruet ruit rurc rure ruri ruru rute ruti rutt rutu tbcb tbcc tbce tbit tbrb tccc tccu tctc tebu tecr tect teec teer teet teic teie teir teiu ter- terc tere teri terr teru tete teti tetr tett tetu teut tibi tibu ticc tice tie- tiee tiei tier tiet tiit tiiu tirb tire tiri tirr tiru titc tite titi titt titu trcc tre- trec tree trei tret treu tri- trib tric trie trit trtc trte trtr trub truc true trut truu ttbb tter tttt tubb tube tubr tubu tucc tuei tuer tuet tuit tuiu turb turc ture turi turr turt turu tute tuti tutt tutu u-ie ubbe ubbi uber ubet ubic ubii ubir ubit ucbc ucci ucrc ucut ueir uirr urbe urbi urci ure- uret urib uric urie uriu urre urri urte urur urut utec uter utri utti uttu uuri uuuu

-tree bbbee be-er beber bebic bebti becic beciu becue becut beebe beeri beete beeut beibi beice beier beire beite berbe bercu berec berei beret berie berit beriu berre berri berru berte berti betee beter betie betre bett- bette betti beuer beure beute bibbe biber bibic bibie bibri bicer biebe biere bieri biert bieti birie birur biter bitit bitru bitte bitti biure brebu brece breer breet breit brere brett breu- bribe brice briec brier brite britt brrrr bruce bruer bruet bruit bruiu bruri brute btc-e btr-t bubbe