-er bbb bbc bbe bbf bbk bbo bbr bcb bcc bce bcf bck bco bcr be- beb bec bee bef bek beo ber bfb bfc bfe bff bfo bfr bkb bkc bke bkf bkk bko bkr bob boc boe bof bok boo bor brb bre brf brk bro brr c-- cbb cbc cbe cbf cbk cbo cbr ccb ccc cce ccf cck cco ccr ce- ceb cec cee cef cek ceo cer cfb cfc cfe cff cfk cfo cfr ckb ckc cko co- cob coc coe cof cok coo cor crb crc cre crf crk cro crr ebb ebc ebe ebf ebk ebo ebr ec- ecb ecc ece ecf eck eco ecr eeb eec eee eef eek eeo eer ef- efb efc efe eff efo efr ekb ekc eke ekf eko ekr eo- eob eoc eoe eof eok eoo eor erb erc ere erf erk ero err fbb fbc fbe fbf fbk fbo fbr fcb fcc fce fcf fck fco fcr feb fec fee fef fek feo fer ffc ffe fff ffk ffo ffr fkb fkc fkf fkk fob foc foe fof fok foo for frb frc fre frf frk fro frr kbb kbc kbe kbf kbk kbo kbr kcb kcc kce kck kcr ke- keb kec kee kef kek keo ker kfc kff kfo kkb kkc kke kkk kkr kob koc koe kof kok koo kor krc krf krk kro krr ob- obb obc obe obf obk obo obr oc- ocb occ ocf ock oco ocr oeb oec oee oef oeo oer of- ofb ofc ofe off ofo ofr okb okc oke okk oko okr oo- oob ooc oof ook ooo oor or- orb orc ore orf ork oro orr rbb rbc rbe rbf rbk rbo rbr rcb rcc rce rcf rco rcr re- reb rec ree ref rek reo rer rfb rfc rfe rff rfk rfo rfr rkb rkc rke rkf rkk rko rob roc roe rof rok roo ror rrb rrc rrf rrk rrr

bbbb bbeb bbfc bbrc bcbc bccc bcec bcer bcfc bcof bcor bebb bebe bebo beck beeb beef beek beer befe beff befo beke beko beo- beof beok beor berc bere berk bero berr bobb bobe bobo boce bock boco boec boee boef boeo boer bofe boff boke boko boob booc booe boof book boor bor- bore borf bork boro borr brcb brce breb brec bree bref brek breo brer brfc brkb brob broc broe brok broo bror brrr c-bo cbbc cbcc cbce cbcr cbec cbee cbef cber cbfb cbfc cbko cbkr cbre ccbc cccb cccc cccf ccee ccfc ccff ccob ccoc ccrc ccre ccrf cec- cece ceco ceeb ceec cef- cefc ceke ceor cer- cerc cere cerf cero cfbc cfbr cfcb cfcf cfco cffb cffr cfor cfrb cfre ckbc ckbe ckck ckco cker ckfr ckob ckoc ckoo ckor ckrc cobb cobe cobo coce cock coco cofc cofe coff cok- coke coko coob coof cook cor- corb corc core corf cork coro corr crbc crcc crce crcr cre- creb crec cree 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- ecrc ecrf ecrr eeee eefe eeke eeoc eerc eero efbr efco efeo efke efor ekco ekeb ekek eker ekfc eore erbb erbe ercc erce ereb erec erer erfc erke erob eroc eroe eroo errc erre erro f--k fccf febo fece feck feeb feek feer fefc fefe feff fefo feke feko feof ferb ferc fere ferk fero ferr ffcc ffee ffff ffrr foce fock foco foer fofo foke foof fook for- forb fore fork foro forr frbc frcc free freo frfc frob froe kbbb kbbc kbbe kbbf kbbk kbbo kbbr kbcb kbce kbck kbco kbcr kbeb kbec kbee kbef kbek kbeo kber kbfb kbfc kbff kbfk kbfo kbfr kbkb kbkf kbkk kbko kbkr kbob kboc kboe kbok kboo kbrb kbrc kbre kbrf kbrk kbro kcbc kcbf kcbk kcbr kccb kccc kcck kccr kceb kcec kcee kceo kcfb kcfc kcfo kckc kckf kckk kcko kckr kcob kcoe kcof kcor kcrc kcro kcrr kebb kebc kebe kebr keck keco kecr keef keek keer kefb kefc keff kefr kekb kekc keke keko keok ker- kerb kerc kere kerf kerk kero kerr kfbc kfbk kfcf kfco kfcr kfeb kfer kffb kfff kffk kfkb kfok kfoo kfor kfrc kfre kfro kfrr kkbb kkbe kkbo kkbr kkcb kkck kkco kkcr kkfr kkkk kkob kkoo kkor kkrb kkrc kkre kkrf kkrk kkro kkrr kobb kobc kobe kobk kobo kobr kocb kocf kock kofc kofe koff kofk kofo kokb kokc koke kokf kokk koko kokr koob kooc kook kooo koor korb korc kore korf kork koro korr krbb krbe krbk krbr krcb krcc krce krco kreb krec kree kref krek kreo krfc krfe krff krfo krkc krke krkk krko krkr krob kroc kroe krof krok kroo kror krrb krrc krre krrf krrk krro krrr o-eo obbo obec ober obkb oboe obok obor obre obro ocbc occc oce ocee ocef ocke ocre ocro ocrr oec- oecc oeec oere ofcr ofek ofer off- offc offe offo offr ofor ofre oker okko okok okor okre okro oobe oocr ooer ooff oooo oore orbb orbe orbo orce orco ore- oreb orec orek oreo orer orfe orff orke orko oro- oroe orof orok oror orro rbbb rbbr rcbc rcbo rccb rccc rcfc rebb rebe rebk rebo recc rece reck recr reeb reef reek refe reff refr reke reko reof rere rero rfef rffc rkkf rob- robb robe robo rocc roce rock roco roer rofc rofe roff rofo roke rokk roko rokr roob roof rook roor rorc rore rork roro rrfc rrrr

b-r-k bbbee bbook bcock be-er be-ro bebek beber becco becke beebe beeke beffe befoe befor beker bekke bekko bekok beofe beoff berbe berck berec berek berk- berke berko berob beroe berok beror berre bo-bo bobek bobko boboc bobok bobr bobre bocce bocke bocor boece boeck boeke boero boffo bokeo boker bokko bokok bokor booce boock booco booer booke booko boore borbo borce borck borec boree borek