-er bbb bbc bbe bbf bbk bbo bbr bbt bcb bcc bce bcf bck bco bcr bct be- beb bec bee bef bek beo ber bet bfb bfc bfe bff bfo bfr bft bkb bkc bke bkf bkk bko bkr bkt bob boc boe bof bok boo bor bot brb bre brf brk bro brr brt btb btc bte btf btk bto btr btt c-- cbb cbc cbe cbf cbk cbo cbr cbt ccb ccc cce ccf cck cco ccr cct ce- ceb cec cee cef cek ceo cer cet cfb cfc cfe cff cfk cfo cfr cft ckb ckc cko ckt co- cob coc coe cof cok coo cor cot crb crc cre crf crk cro crr crt ctb ctc cte ctf ctk cto ctr ctt ebb ebc ebe ebf ebk ebo ebr ebt ec- ecb ecc ece ecf eck eco ecr ect eeb eec eee eef eek eeo eer eet ef- efb efc efe eff efo efr eft ekb ekc eke ekf eko ekr ekt eo- eob eoc eoe eof eok eoo eor eot erb erc ere erf erk ero err ert etb etc ete etf etk eto etr ett fbb fbc fbe fbf fbk fbo fbr fbt fcb fcc fce fcf fck fco fcr fct feb fec fee fef fek feo fer fet ffc ffe fff ffk ffo ffr fft fkb fkc fkf fkk fkt fob foc foe fof fok foo for fot frb frc fre frf frk fro frr frt ftb ftc fte ftf ftk fto ftr ftt k-t kbb kbc kbe kbf kbk kbo kbr kcb kcc kce kck kcr kct ke- keb kec kee kef kek keo ker ket kfc kff kfo kkb kkc kke kkk kkr kkt kob koc koe kof kok koo kor kot krc krf krk kro krr krt ktb ktc kte ktf ktk kto ktr ktt ob- obb obc obe obf obk obo obr obt oc- ocb occ ocf ock oco ocr oct oeb oec oee oef oeo oer oet of- ofb ofc ofe off ofo ofr oft okb okc oke okk oko okr oo- oob ooc oof ook ooo oor oot or- orb orc ore orf ork oro orr ort ot- otb otc ote otf otk oto otr ott rbb rbc rbe rbf rbk rbo rbr rbt rcb rcc rce rcf rco rcr rct re- reb rec ree ref rek reo rer ret rfb rfc rfe rff rfk rfo rfr rft rkb rkc rke rkf rkk rko rkt rob roc roe rof rok roo ror rot rrb rrc rrf rrk rrr rrt rtb rtc rte rtf rtk rto rtr rtt tbb tbc tbe tbf tbk tbo tbr tbt tcb tcc tce tcf tck tco tcr tct te- teb tec tee tef tek teo ter tet tfb tfc tfe tff tfk tfo tfr tft tkb tkc tke tkk tko tkr tkt to- tob toc toe tof tok too tor tot trb trc tre trf trk tro trr trt ttb ttc tte ttf ttk tto ttr ttt

bbbb bbeb bbet bbfc bbrc bcbc bccc bcec bcer bcet bcfc bcof bcor bctc bebb bebe bebo beck beeb beef beek beer beet befe beff befo beft beke beko beo- beof beok beor beot berc bere berk bero berr bert betc bete beto bett bftt bobb bobe bobo boce bock boco boec boee boef boeo boer boet bofe boff boke boko boob booc booe boof book boor boot bor- bore borf bork boro borr bort botb bote boto bott brcb brce breb brec bree bref brek breo brer bret brfc brkb brob broc broe brok broo bror brot brrr brtc btcc btec btek btfc btob btor btrc btrt bttb c-bo cbbc cbcc cbce cbcr cbct cbec cbee cbef cber cbet cbfb cbfc cbko cbkr cbot cbre cbrt cbtc cbtf ccbc cccb cccc cccf ccee ccfc ccff ccob ccoc ccrc ccre ccrf ccrt cctb cctc cctt cec- cece ceco cect ceeb ceec cef- cefc ceke ceor cer- cerc cere cerf cero cert cet- cete ceto cfbc cfbr cfbt cfcb cfcf cfco cffb cffr cfor cfrb cfre cfrt cftc cfte cftk cftr ckbc ckbe ckck ckco cker ckfr ckob ckoc ckoo ckor ckot ckrc cktb cobb cobe cobo coce cock coco coct cofc cofe coff coft cok- coke coko coob coof cook coot cor- corb corc core corf cork coro corr cort cotb cotc cote coto cott crbc crcc crce crcr cre- creb crec cree creo cret crfc crkc crob croc croe crok croo cror crot crrt crtc crtf ctcf ctec ctfc ctfo ctor ctot ctrc ebbc ebbo ebbr ebcc eber ebfc eboe eboo ebor ebro ecbc ecbe eccb eccc ecce ecco ecct ecef ecfc ecfr ecko eco- ecot ecrc ecrf ecrr ect- ectc ectf ecto eeee eefe eeke eeoc eerc eero eetc eete efbr efco efeo efet efke efor eft- ekco ekeb ekek eker eket ekfc eore eotc eoto erbb erbe ercc erce ereb erec erer eret erfc erft erke erob eroc eroe eroo errc erre erro etbc etbr etcc etco etec etee eter etfb etfc etfe etoe etok etre etro ette etto f--k fccf fcot fcto febo fece feck fect feeb feek feer feet fefc fefe feff fefo feke feko feof ferb ferc fere ferk fero ferr fert fete fetr fett ffcc ffee ffff ffrr fftf fobt foce fock foco foer fofo foke foof fook foot for- forb fore fork foro forr fort fote foto fott frbc frcc free freo fret frfc frob froe frot ft-c fter ftfc kbbb kbbc kbbe kbbf kbbk kbbo kbbr kbbt kbcb kbce kbck kbco kbcr kbct kbeb kbec kbee kbef kbek kbeo kber kbet kbfb kbfc kbff kbfk kbfo kbfr kbft kbkb kbkf kbkk kbko kbkr kbob kboc kboe kbok kboo kbot kbrb kbrc kbre kbrf kbrk kbro kbrt kbtb kbtc kbte kbtf kbtk kbto kbtr kbtt kcbc kcbf kcbk kcbr kccb kccc kcck kccr kcct kceb kcec kcee kceo kcet kcfb kcfc kcfo kcft kckc kckf kckk kcko kckr kcob kcoe kcof kcor kcot kcrc kcro kcrr kcrt kctb kctc kcte kcto kebb kebc kebe kebr kebt