-er bbb bbc bbe bbg bbk bbr bbt bcb bcc bce bcg bck bcr bct be- beb bec bee beg bek ber bet bgb bgc bge bgg bgk bgr bgt bkb bkc bke bkg bkk bkr bkt brb bre brg brk brr brt btb btc bte btg btk btr btt c-- cbb cbc cbe cbg cbk cbr cbt ccb ccc cce ccg cck ccr cct ce- ceb cec cee ceg cek cer cet cgb cgc cge cgg cgr cgt ckb ckc ckt crb crc cre crg crk crr crt ctb ctc cte ctg ctk ctr ctt ebb ebc ebe ebg ebk ebr ebt ec- ecb ecc ece ecg eck ecr ect eeb eec eee eeg eek eer eet egb egc ege egg egr egt ekb ekc eke ekg ekr ekt erb erc ere erg erk err ert etb etc ete etg etk etr ett gbc gbe gbg gbk gbr gbt gcb gcc gce gcg gck gcr gct ge- geb gec gee geg gek ger get ggb ggc ggg ggr ggt gkb gkt grb grc gre grg grk grr grt gtb gtc gte gtg gtk gtr gtt k-t kbb kbc kbe kbk kbr kcb kcc kce kcg kck kcr kct ke- keb kec kee keg kek ker ket kgb kgc kkb kkc kke kkk kkr kkt krc krg krk krr krt ktb ktc kte ktg ktk ktr ktt rbb rbc rbe rbg rbk rbr rbt rcb rcc rce rcg rcr rct re- reb rec ree reg rek rer ret rgb rgc rge rgg rgk rgr rgt rkb rkc rke rkg rkk rkt rrb rrc rrg rrk rrr rrt rtb rtc rte rtg rtk rtr rtt tbb tbc tbe tbg tbk tbr tbt tcb tcc tce tcg tck tcr tct te- teb tec tee teg tek ter tet tgb tgc tge tgg tgk tgr tgt tkb tkc tke tkg tkk tkr tkt trb trc tre trg trk trr trt ttb ttc tte ttg ttk ttr ttt

bbbb bbeb bbet bbrc bbrg bcbc bcbg bccc bcec bcer bcet bctc bebb bebe beck beeb beeg beek beer beet begg beke berc bere berg berk berr bert betc bete bett brcb brce breb brec bree breg brek brer bret brkb brrr brtc btcc btec btek btrc btrt bttb cbbc cbcc cbce cbcr cbct cbec cbee cber cbet cbgb cbkg cbkr cbre cbrt cbtc ccbc cccb cccc ccee ccgc ccgt ccrc ccre ccrg ccrt cctb cctc cctt cec- cece cect ceeb ceec cege ceke cer- cerc cere cert cet- cete cgcc cgcg cger ckbc ckbe ckck cker ckrc cktb crbc crcc crce crcr cre- creb crec cree creg cret crkc crrt crtc ctec ctge ctrc ebbc ebbr ebcc eber ecbc ecbe eccb eccc ecce ecct ecrc ecrr ect- ectc eeee eeke eerc eerg eetc eete egbe egcc egcg egcr egec egee eger eggb egge egre egte egtk ekeb ekek eker eket erbb erbe ercc erce ereb erec erer eret erg- ergg erke errc erre etbc etbr etcc etec etee eter etre ette gc-c gcbc gccc gcet gcrg gctc gebe gece geck geek geer geet gege gegg gerb gere gert getb gete getg getk gett ggbt gggg grbr grcc grce greb grec gree greg gret grrr grtc gtbr gtcr kbbb kbbc kbbe kbbg kbbk kbbr kbbt kbcb kbce kbck kbcr kbct kbeb kbec kbee kbek kber kbet kbgb kbge kbgg kbgr kbgt kbkb kbkg kbkk kbkr kbrb kbrc kbre kbrg kbrk kbrt kbtb kbtc kbte kbtk kbtr kbtt kcbc kcbk kcbr kccb kccc kcck kccr kcct kceb kcec kcee kceg kcet kcgc kcgr kckc kckk kckr kcrc kcrg kcrr kcrt kctb kctc kcte kebb kebc kebe kebr kebt kecg keck kecr keek keer keet kege kegg kegk kegr kekb kekc keke ker- kerb kerc kere kerk kerr kert ket- ketc kete ketk ketr kett kgbb kgbc kgbr kgbt kgcb kgcc kgce kgcr kgeb kgec kget kggg kggr kgrb kgrc kgre kgrg kgrk kgrr kgrt kgtk kkbb kkbe kkbg kkbr kkbt kkcb kkck kkcr kkct kkeg kkgb kkgr kkkk kkrb kkrc kkre kkrk kkrr kkrt kktc kktk krbb krbe krbg krbk krbr krbt krcb krcc krce krcg kreb krec kree krek kret krgt krkc krke krkk krkr krrb krrc krre krrg krrk krrr krrt krtc krtk krtr ktbb ktbc ktbg ktbr ktbt ktcc ktce ktck ktcr ktec ktee kteg ktek ktge ktgg ktgr ktkb ktkc ktke ktkk ktkr ktkt ktrb ktrc ktre ktrg ktrk ktrr ktrt kttc kttg kttk kttr kttt rbbb rbbr rcbc rccb rccc rcet rcgc rcrg rctc rctg rebb rebe rebk recc rece reck recr rect reeb reek reet rege regr regt reke rekt rere rerg rert rete retr rett rgbe rgtr rrrr rtcc rtce rtcg rtee rtkg tbcb tbcc tbce tbrb tccc tctc teck tecr tect teec teek teer teet tegg tegt teke ter- terc tere terk terr tete tetr tett tgcc tgtc tkkg trcc tre- trec tree treg trek tret trge trtc trte trtr ttbb tter ttkg tttt

-tree b-r-k bbbee be-er bebek beber becke beebe beeke beete begee beget begge beker bekke berbe berck berec bereg berek beret berge berk- berke berre berte betee beter betke betre bett- bette brece breck breek breer breet breg- brege bregg breke brere brett brrrr btc-e btr-t c-tec ccccc ccett cebec ceber ceere cegge cerc- cerce cerec cerer ceret cerge cerke cerre certe cette crebe crece creek creer cregg creke crete ctree cttee ebber ebbet eberg ebert ecker eecke eeeee egger egrek egret ekker erbbe erber erceg erect erege erere erkec erte erter eteke etete etree etrek etter gbeke gberg geber gebet gebke gebre geere geert geete gegge gerbe gerce gerke gerre gertt getee geter gette grebe grece greek greer greet grege gregg grete grett grrrr gtk-- k-gee k-t-b kebbe kebek keber kecer keere keget kekec kerek keret kerre ketek keter kette kreek kreke krete rebbe rebec rebeg reber rebet recce recet recke rect- recte reece reege reere regec reger reget regge regtt rekke rere- reree reret retee reter retrg rette rt-rk tbtbt teber tebet tectb teege tegre teket tekke terce terek teret terge terre tert-