-er bbb bbc bbd bbe bbo bbr bbt bcb bcc bcd bce bco bcr bct bdb bdc bdd bde bdo bdr bdt be- beb bec bed bee beo ber bet bob boc bod boe boo bor bot brb brd bre bro brr brt btb btc btd bte bto btr btt c-- cbb cbc cbd cbe cbo cbr cbt ccb ccc ccd cce cco ccr cct cdb cdc cdd cde cdo cdr cdt ce- ceb cec ced cee ceo cer cet co- cob coc cod coe coo cor cot crb crc crd cre cro crr crt ctb ctc ctd cte cto ctr ctt dbb dbc dbd dbe dbo dbr dbt dcb dcc dcd dce dco dcr dct ddb ddc ddd dde ddo ddr ddt de- deb dec ded dee deo der det dob doc dod doe doo dor dot drb drc drd dre dro drr drt dtb dtc dtd dte dto dtr dtt ebb ebc ebd ebe ebo ebr ebt ec- ecb ecc ecd ece eco ecr ect ed- edb edc edd ede edo edr edt eeb eec eed eee eeo eer eet eo- eob eoc eod eoe eoo eor eot erb erc erd ere ero err ert etb etc etd ete eto etr ett ob- obb obc obd obe obo obr obt oc- ocb occ ocd oco ocr oct odb odc odd ode odo odr odt oeb oec oed oee oeo oer oet oo- oob ooc ood ooo oor oot or- orb orc ord ore oro orr ort ot- otb otc otd ote oto otr ott rbb rbc rbd rbe rbo rbr rbt rcb rcc rcd rce rco rcr rct rdb rdc rdd rde rdo rdr rdt re- reb rec red ree reo rer ret rob roc rod roe roo ror rot rrb rrc rrd rrr rrt rtb rtc rtd rte rto rtr rtt tbb tbc tbd tbe tbo tbr tbt tcb tcc tcd tce tco tcr tct tdb tdc tdd tde tdo tdr tdt te- teb tec ted tee teo ter tet to- tob toc tod toe too tor tot trb trc trd tre tro trr trt ttb ttc ttd tte tto ttr ttt

bbbb bbdd bbdo bbeb bbet bbrc bcbc bccc bcde bcec bcer bcet bcor bctc bd-r bdbc bddc bebb bebe bebo bede bedo beeb beed beer beet beo- beod beor beot berc berd bere bero berr bert betc bete beto bett bobb bobe bobo boce boco bodb bode bodo boec boee boeo boer boet boob booc bood booe boor boot bor- bord bore boro borr bort botb botd bote boto bott brcb brce brdo brdt breb brec bred bree breo brer bret brob broc brod broe broo bror brot brrr brtc btcc btdt btec btob btor btrc btrt bttb c-bo c-cd cbbc cbcc cbce cbcr cbct cbdb cbdc cbdo cbec cbee cber cbet cbot cbrd cbre cbrt cbtc ccbc cccb cccc ccdc ccdr cced ccee ccob ccoc ccod ccrc ccre ccrt cctb cctc cctt cd-e cd-r cddb cddr cdec cder cdot cdre cec- cece ceco cect cedd cede cedo cedt ceeb ceec ceor cer- cerc cerd cere cero cert cet- cete ceto cobb cobe cobo coce coco coct codd code coed coob cood coot cor- corb corc cord core coro corr cort cotb cotc cote coto cott crbc crcc crce crcr crdc cre- creb crec cred cree creo cret crob croc crod croe croo cror crot crrt crtc ctec ctor ctot ctrc d-bo dbcc dbtt dcbc dccb dccc dcct dcdb dctc dddd ddoc ddot ddrc ddre debe debt dec- decc decd dece deco dect dedd dede dedo deeb deed deer deet deor der- derb derc dere dero derr dete deto detr dobb dobe doce doco doct dod- dodd dode dodo doer doob dood door doot dorc dord dore doro dorr dort dotd dote doto dott drbc dred dree dret drob drod drot dtcc dted dtor dtot ebbc ebbo ebbr ebcc ebed eber eboe eboo ebor ebro ecbc ecbe eccb eccc ecce ecco ecct ecdc eced eco- ecod ecot ecrc ecrr ect- ectc ecto eddc edde eddo ede- eder edoc edod eede eeee eeoc eerc eero eetc eete eocd eode eore eotc eotd eoto erbb erbe ercc erce erde ereb erec ered erer eret erob eroc erod eroe eroo errc erre erro etbc etbr etcc etco etec etee eter etoe etre etro ette etto o-eo obbo obdt obec obed ober obet oboe obor obot obre obro obtd ocbc occc occt oce oced ocee ocet ocre ocro ocrr oct- octe octo odbo oddd oded odeo oder odet odoo odor odot oec- oecc oedo oeec oere oobe oocr ooer oooo oord oore oort ootb orbb orbe orbo orce orco orde ordo ore- oreb orec ored oreo orer oro- oroe oror orot orro ortc orte orto otbd otcd oted otee oter oto- otoe otoo otor otre otro otte otto rbbb rbbr rcbc rcbo rccb rccc rcdc rcde rcet rcrd rctc rder rdoc rebb rebe rebo recc recd rece recr rect redc redd rede redo redr reeb reed reet reod reot rerd rere rero rert retd rete reto retr rett rob- robb robe robo robt rocc roce roco rodd rode rodo roed roer roet roob rood roor root rorc rore roro rort rotc rote roto rotr rott rred rrrr rtcc rtce rtdt rtee tbcb tbcc tbcd tbce tbrb tccc tcdd tctc tddb tdor tebo teco tecr tect tedd tede teec teed teer teet teor ter- terc tere tero terr tete teto tetr tett tobe tobo tobt toce toco todd tode todo todt toed toee toer toet tood toor toot torc tord tore toro torr tort totc totd tote toto totr tott trcc tre- trec tred tree treo tret troc trod troe troo trot trtc trte trtr ttbb tteo tter ttoe tttt

-tree b-e-d bbbee bcced bcode bd-re bdoor bdort be-er be-ro bebdo bebed beber bebod bebot becco bedde bedee beder bedet bedot beebe beede beerd beete beode beord beote berbe berde berec bered beret berob beroe beror berre berte berto betee beter betoo betor betre bett- bette betto bo-bo bobet boboc