-er -ic bbb bbc bbe bbi bbr bbt bcb bcc bce bci bcr bct be- beb bec bee bei ber bet bi- bib bic bie bii bir bit brb bre bri brr brt btb btc bte bti btr btt c-- cbb cbc cbe cbi cbr cbt ccb ccc cce cci ccr cct ce- ceb cec cee cei cer cet ci- cib cic cie cii cir cit crb crc cre cri crr crt ctb ctc cte cti ctr ctt ebb ebc ebe ebi ebr ebt ec- ecb ecc ece eci ecr ect eeb eec eee eer eet eib eic eie eii eir eit erb erc ere eri err ert etb etc ete eti etr ett ibb ibc ibe ibi ibr ibt icb icc ice ici icr ict ie- iec iee iei ier iet iib iic iie iii iir iit ir- irb irc ire iri irr irt itb itc ite iti itt rbb rbc rbe rbi rbr rbt rcb rcc rce rci rcr rct re- reb rec ree rei rer ret rib ric rie rii rir rit rrb rrc rri rrr rrt rtb rtc rte rti rtr rtt tbb tbc tbe tbi tbr tbt tcb tcc tce tci tcr tct te- teb tec tee tei ter tet tib tic tie tii tir tit trb trc tre tri trr trt ttb ttc tte tti ttr ttt

bbbb bbci bbeb bbet bbrc bcbc bccc bcci bcec bcer bcet bcie bcit bctc bebb bebe bebi beci beeb beer beet beic beir beit berc bere beri berr bert betc bete beti bett bibb bibe bibi bicc bice bici bieb bier biet birb bire biri birr birt bitc bite bitt brcb brce breb brec bree brei brer bret bric brie brit brrr brtc btcc btec btie btrc btrt bttb cbbc cbcc cbce cbcr cbct cbec cbee cber cbet cbir cbit cbre cbrt cbtc ccbc cccb cccc ccci ccee ccic ccii ccir ccrc ccre ccri ccrt cctb cctc cctt cec- cece ceci cect ceeb ceec cer- cerc cere ceri cert cet- cete ceti cibc cibe cibi cicc cici cicr cict ciee cier ciii ciit cirb circ cire ciri cirr cirt citb cite citi citt crbc crcc crce crcr cre- creb crec cree crei cret crib cric crie crit crrt crtc ctbi ctec ctic ctrc ebbc ebbr ebcc eber ebic ebit ecbc ecbe eccb eccc ecce ecci ecct ecib ecit ecrc ecri ecrr ect- ectc eeee eerc eetc eete eiec eiei eier eire eitb eitc eiti eitr erbb erbe ercc erce ereb erec erei erer eret eric erie erit errc erre etbc etbr etcc etec etee eter etic etre ette etti i-be ibec ibet ibie ibrc ibri ibtb ibtc icbc iccb iccc icci iccr icct icec icee icer icet icrc icre icrr icrt iecc ieet ieie iere ieri iett iiie iiii iiit iirc iitr iitt irbe ircc iree irer iri- iric irie irrc irre irri irte irti itbe itec iter itet itic itie itri rbbb rbbr rcbc rccb rccc rcet rcic rctc rcti rebb rebe recc rece reci recr rect reeb reet reii reir reit rere reri rert rete reti retr rett rib- ribe ricc rice rict rier riet rire riri rite riti ritt rrrr rtcc rtce rtee rtei tbcb tbcc tbce tbit tbrb tccc tctc tecr tect teec teer teet teic teie teir ter- terc tere teri terr tete teti tetr tett tibi ticc tice tie- tiee tiei tier tiet tiit tirb tire tiri tirr titc tite titi titt trcc tre- trec tree trei tret tri- trib tric trie trit trtc trte trtr ttbb tter tttt

-tree bbbee be-er beber bebic bebti becic beebe beeri beete beibi beice beier beire beite berbe berec berei beret berie berit berre berri berte berti betee beter betie betre bett- bette betti bibbe biber bibic bibie bibri bicer biebe biere bieri biert bieti birie biter bitit bitte bitti brece breer breet breit brere brett bribe brice briec brier brite britt brrrr btc-e btr-t c-tec ccccc cccii ccett cciii ccitt cebec ceber cebit ceci- cecie cecri ceere ceirt cerc- cerce cerci cerec cerer ceret ceric cerie cerre certe cetic cette ciber cibir cicer cietc circe ciric cirie cirr- cirri citec citee citer citie citr- citte crebe crece creer crete cribb cribe crice crier ctree ctrie cttee ebber ebbet ebbie ebert ebibe ecrit eeeee eerie eetti eirie eiter eitri erbbe erber erect erere ericb erice erier eriic erite erte erter etete etite etree etter ettie i-bet ibert ibeti icbrr ice-t iceci iceit icici icier icter ictic iebet iecee ieiri ierei iette iiiee iiiii iitti irbit ircii irece irete irite irrit irtec itbit itete itire itter ittre ittti rcirc rebbe rebec reber rebet rebit recce recet recit rect- recte recti reece reere reeti reice rere- reree reret reric rerir retee reter retie rette ribbi ribce riber ribet ribie ricci ricer rieti ririe rtice tbeti tbtbt teber tebet tebi- tecic tectb terce teret terre terri tert- teter tetr- tetri tette ti-ti tibbi tiber tibet ticci ticer tieit tiere tieri tiree tirer tiret tirit titcr titer titii titre titte titti treer treet treib treie treit trere treri trete trett tribe trice trieb triei trier triet trit- trite tritt ttttt

b-tree bbbbbb bebite becice beebee beeter beiber berbee berber bereet berere berrer berret berric berrie bertie bertre betere betete betire bettee better bettie bibber bibice bibiri bieber bierce bircii biribi biteit bitice bitier bitter bittie breere breite brette bribe- bribee briber bribir bribri c-trie cebeci ceecee ceitec cercie cerete cerice cerici cerite certie cibber cicree cirice cirici cirri- citect citice citri- citric creete cretic critic ebbert ebr-ii ebrie ecrier ecrire eebree eerect eerier eibert erbree erebti ericii errett etcetc i-bere i-bete i-crei i-tree iberic ibrict icter- iritic irrite ittiri r-tree rebbec rebbit rebice rebite receit recice reciet recite recti- reiber reiter retece reteer reteet retere retire retree retret retter ribber ribbet ribbie ribbit ribibe ribici ribier ricet ricice rieber rieter riette rietti rititi ritter t-tree tebbit tecbir tecici teebee teetee teeter teirce teirei terbic tercer tercet terete teribe terrer terret terric terrie territ terter tertre tetete tetric tetter