-er bbb bbc bbe bbf bbg bbk bbo bbr bcb bcc bce bcf bcg bck bco bcr be- beb bec bee bef beg bek beo ber bfb bfc bfe bff bfg bfo bfr bgb bgc bge bgf bgg bgk bgo bgr bkb bkc bke bkf bkg bkk bko bkr bob boc boe bof bog bok boo bor brb bre brf brg brk bro brr c-- cbb cbc cbe cbf cbg cbk cbo cbr ccb ccc cce ccf ccg cck cco ccr ce- ceb cec cee cef ceg cek ceo cer cfb cfc cfe cff cfg cfk cfo cfr cgb cgc cge cgg cgo cgr ckb ckc cko co- cob coc coe cof cog cok coo cor crb crc cre crf crg crk cro crr ebb ebc ebe ebf ebg ebk ebo ebr ec- ecb ecc ece ecf ecg eck eco ecr eeb eec eee eef eeg eek eeo eer ef- efb efc efe eff efg efo efr egb egc ege egf egg ego egr ekb ekc eke ekf ekg eko ekr eo- eob eoc eoe eof eog eok eoo eor erb erc ere erf erg erk ero err fbb fbc fbe fbf fbg fbk fbo fbr fcb fcc fce fcf fcg fck fco fcr feb fec fee fef feg fek feo fer ffc ffe fff ffg ffk ffo ffr fgb fgc fge fgf fgg fgr fkb fkc fkf fkg fkk fob foc foe fof fog fok foo for frb frc fre frf frg frk fro frr gbc gbe gbf gbg gbk gbo gbr gcb gcc gce gcf gcg gck gco gcr ge- geb gec gee gef geg gek geo ger gfb gfc gfe gff gfk gfo gfr ggb ggc ggg ggo ggr gkb gko gob goc goe gof gog gok goo gor grb grc gre grf grg grk gro grr kbb kbc kbe kbf kbk kbo kbr kcb kcc kce kcg kck kcr ke- keb kec kee kef keg kek keo ker kfc kff kfg kfo kgb kgc kgf kgo kkb kkc kke kkk kkr kob koc koe kof kog kok koo kor krc krf krg krk kro krr ob- obb obc obe obf obg obk obo obr oc- ocb occ ocf ocg ock oco ocr oeb oec oee oef oeg oeo oer of- ofb ofc ofe off ofg ofo ofr ogc oge ogf ogg ogo okb okc oke okg okk oko okr oo- oob ooc oof oog ook ooo oor or- orb orc ore orf org ork oro orr rbb rbc rbe rbf rbg rbk rbo rbr rcb rcc rce rcf rcg rco rcr re- reb rec ree ref reg rek reo rer rfb rfc rfe rff rfg rfk rfo rfr rgb rgc rge rgf rgg rgk rgo rgr rkb rkc rke rkf rkg rkk rko rob roc roe rof rog rok roo ror rrb rrc rrf rrg rrk rrr

bbbb bbeb bbfc bbrc bbrg bcbc bcbg bccc bcec bcer bcfc bcof bcor bebb bebe bebo beck beeb beef beeg beek beer befe beff befo begg bego beke beko beo- beof beok beor berc bere berg berk bero berr bfgf bgfc bobb bobe bobo boce bock boco boec boee boef boeo boer bofe boff boge bogg bogo boke boko boob booc booe boof boog book boor bor- bore borf borg bork boro borr brcb brce breb brec bree bref breg brek breo brer brfc brkb brob broc broe brog brok broo bror brrr c-bo cbbc cbcc cbce cbcr cbec cbee cbef cber cbfb cbfc cbgb cbkg cbko cbkr cbre ccbc cccb cccc cccf ccee ccfc ccff ccgc ccob ccoc ccrc ccre ccrf ccrg cec- cece ceco ceeb ceec cef- cefc cege cego ceke ceor cer- cerc cere cerf cero cfbc cfbr cfcb cfcf cfco cffb cffr cfgo cfor cfrb cfre cfrg cgcc cgcg cger cgfc cgro ckbc ckbe ckck ckco cker ckfr ckgo ckob ckoc ckoo ckor ckrc cobb cobe cobo coce cock coco cofc cofe coff cogo cok- coke coko coob coof cook cor- corb corc core corf corg cork coro corr crbc crcc crce crcr cre- creb crec cree creg creo crfc crkc crob croc croe crok croo cror ebbc ebbo ebbr ebcc eber ebfc eboe eboo ebor ebro ecbc ecbe eccb eccc ecce ecco ecef ecfc ecfr ecko eco- ecog ecrc ecrf ecrr eeee eefe eeke eeoc eerc eerg eero ef-g efbr efco efeo efke efor egbe egcc egcg egcr egec egee eger egfr eggb egge eggo ego- egor egre ekco ekeb ekek eker ekfc eore erbb erbe ercc erce ereb erec erer erfc erg- ergg ergo erke erob eroc eroe eroo errc erre erro f--k fccf febo fece feck feeb feek feer fefc fefe feff fefo fege fegg feke feko feof ferb ferc fere ferk fero ferr ffcc ffee ffff ffrr foce fock foco foer fofo foge fogg fogo foke foof fook for- forb fore forg fork foro forr frbc frcc free freo frfc frob froe frog gbbo gbfc gc-c gcbc gccc gccf gcfc gcrg gebe gece geck geek geer gefe gege gegg gego geko geo- geof geog gerb gere gero gfcf gfer gfor ggfg gggg gobe gobo goce gocr goef goer gofe goff gofr gogo goke goof goog gook goor gorb gore gorf gorg goro gorr grbr grcc grce greb grec gree gref greg grob groc grof grog grok groo gror grrr kbbb kbbc kbbe kbbf kbbg kbbk kbbo kbbr kbcb kbce kbck kbco kbcr kbeb kbec kbee kbef kbek kbeo kber kbfb kbfc kbff kbfk kbfo kbfr kbgb kbge kbgg kbgo kbgr kbkb kbkf kbkg kbkk kbko kbkr kbob kboc kboe kbok kboo kbrb kbrc kbre kbrf kbrg kbrk kbro kcbc kcbf kcbk kcbr kccb kccc kcck kccr kceb kcec kcee kceg kceo kcfb kcfc kcfg kcfo kcgc kcgf kcgr kckc kckf kckk kcko kckr kcob kcoe kcof kcog kcor kcrc kcrg kcro kcrr kebb kebc kebe kebr kecg keck keco kecr keef keek keer kefb kefc keff kefr kege kegg kegk kegr kekb kekc keke keko keok ker- kerb kerc kere kerf kerk kero kerr kfbc kfbk kfcf kfco kfcr kfeb kfeg