-er -ol bbb bbc bbe bbl bbo bbr bbt bcb bcc bce bcl bco bcr bct be- beb bec bee bel beo ber bet blb blc ble bll blo blr blt bob boc boe bol boo bor bot brb bre brl bro brr brt btb btc bte btl bto btr btt c-- cbb cbc cbe cbl cbo cbr cbt ccb ccc cce ccl cco ccr cct ce- ceb cec cee cel ceo cer cet cl- clb clc cle cll clo clr clt co- cob coc coe col coo cor cot crb crc cre crl cro crr crt ctb ctc cte ctl cto ctr ctt ebb ebc ebe ebl ebo ebr ebt ec- ecb ecc ece ecl eco ecr ect eeb eec eee eel eeo eer eet elb elc ele ell elo elr elt eo- eob eoc eoe eol eoo eor eot erb erc ere erl ero err ert etb etc ete etl eto etr ett lbb lbc lbe lbl lbo lbr lbt lcb lcc lce lcl lco lcr lct leb lec lee lel leo ler let llb llc lle lll llo llr llt lob loc loe lol loo lor lot lrb lrc lro lrr lrt ltb ltc lte ltl lto ltr ltt ob- obb obc obe obl obo obr obt oc- ocb occ ocl oco ocr oct oeb oec oee oel oeo oer oet olb olc ole oll olo olt oo- oob ooc ool ooo oor oot or- orb orc ore orl oro orr ort ot- otb otc ote otl oto otr ott rbb rbc rbe rbl rbo rbr rbt rcb rcc rce rcl rco rcr rct re- reb rec ree rel reo rer ret rlc rle rll rlo rlr rlt rob roc roe rol roo ror rot rrb rrc rrl rrr rrt rtb rtc rte rtl rto rtr rtt tbb tbc tbe tbl tbo tbr tbt tcb tcc tce tcl tco tcr tct te- teb tec tee tel teo ter tet tlc tle tll tlo tlr tlt to- tob toc toe tol too tor tot trb trc tre trl tro trr trt ttb ttc tte ttl tto ttr ttt

bbbb bbeb bbet bblb bbrc bcbc bccc bccl bcec bcer bcet bcor bctc bebb bebe bebo beeb beel beer beet bele bell belo belt beo- beor beot berc bere bero berr bert betc bete beto bett blbt bleb blee bleo blet blob bloc bloo blot blrc bobb bobe bobo boce boco boec boee boel boeo boer boet bole boll bolo bolt boob booc booe bool boor boot bor- bore boro borr bort botb bote boto bott brcb brce breb brec bree brel breo brer bret brob broc broe brol broo bror brot brrr brtc btcc btcl btec btob btor btrc btrt bttb c-bo cbbc cbcc cbce cbcl cbcr cbct cbec cbee cber cbet cblb cblc cbol cbot cbre cbrl cbrt cbtc cbtl ccbc cccb cccc cccl ccee ccel cclc ccob ccoc ccrc ccre ccrl ccrt cctb cctc cctl cctt cec- cece ceco cect ceeb ceec ceel cel- celc cele cell celo celt ceol ceor cer- cerc cere cerl cero cert cet- cete ceto clec clee cleo cler clet clob cloe cloo clor clot clro cltb cltc cobb cobe cobo coce coco coct coel col- colb cole coll colo colt coob cool coot cor- corb corc core corl coro corr cort cotb cotc cote coto cott crbc crcc crce crcr cre- creb crec cree creo cret crob croc croe crol croo cror crot crrt crtc crtl ctec ctle ctol ctor ctot ctrc ctrl e-cl ebbc ebbo ebbr ebcc ebel eber eboe ebol eboo ebor ebro ecbc ecbe eccb eccc ecce eccl ecco ecct eclt eco- ecol ecot ecrc ecrl ecrr ect- ectc ecto eeee eele eeoc eerc eero eetc eete el-b elbe elbo elcb elce elco elec elee eleo eler elet elle ello elro elte elto eole eolo eore eorl eotc eoto erbb erbe ercc erce ereb erec erel erer eret erle erll erob eroc eroe erol eroo errc erre erro ertl etbc etbr etcc etco etec etee etel eter etoe etre etro ette etto lbcc lblr lbrt lcbc lccc lcce lcer lcor lcrl lctl lcto lebo lece leco lect leel leer leet lele lell lelo leoc leor lerc lere lero lert lete leto lett llcc llet lllc llll lloc lloo lob- lobb lobe lobo locc loce loco loeb lole loll lolo loob looc looe lool loor loot lore loro lote lotl loto lotr lott lroc lrrc lrrr ltbl ltcc ltee lttc lttr o-eo obbo obec obel ober obet oble oboe obol obor obot obre obro ocbc occc occt oce ocee ocet oclc ocre ocrl ocro ocrr oct- octe octo oec- oecc oeec oele oere olbo olcc ole- oleo oler olet olle ollo olor olot oobe oocr ooer oolo oooo oore oort ootb orbb orbe orbo orce orco ore- oreb orec orel oreo orer orle orlo oro- oroe oror orot orro ortc orte orto otcl otee oter oto- otoe otoo otor otre otro otte otto rbbb rbbr rbcl rble rcbc rcbo rccb rccc rcet rcle rctc rebb rebe rebo recc rece recr rect reeb reel reet relb rele rell relo relt reol reot rere rero rert rete reto retr rett rlee rob- robb robe robo robt rocc roce roco roel roer roet role roll rolo rolt roob rool roor root rorc rore roro rort rotc rote rotl roto rotr rott rrle rrrr rtcc rtce rtee rtle rtlt tbcb tbcc tbce tbrb tccc tctc tebo tecl teco tecr tect teec teel teer teet tel- telc tele tell telo telt teor ter- terc tere tero terr tete teto tetr tett tlco tobe tobo tobt toce toco toee toer toet tol- tole toll tolo tolt tool toor toot torc tore toro torr tort totc tote toto totr tott trcc trcl tre- trec tree treo tret troc troe troo trot trtc trte trtr ttbb tteo tter ttoe tttt

-tree bbbee bcell be-er be-ro bebel beber beblo bebot becco becel beebe beele beete belbo belce belec belee belet bellb belle bello belot beote berbe berec berel