-er bbb bbc bbe bbf bbk bbo bbr bbs bbt bcb bcc bce bcf bck bco bcr bcs bct be- beb bec bee bef bek beo ber bes bet bfb bfc bfe bff bfo bfr bfs bft bkb bkc bke bkf bkk bko bkr bks bkt bob boc boe bof bok boo bor bos bot brb bre brf brk bro brr brs brt bsb bsc bse bsf bsk bso bsr bss bst btb btc bte btf btk bto btr bts btt c-- cbb cbc cbe cbf cbk cbo cbr cbs cbt ccb ccc cce ccf cck cco ccr ccs cct ce- ceb cec cee cef cek ceo cer ces cet cfb cfc cfe cff cfk cfo cfr cfs cft ckb ckc cko cks ckt co- cob coc coe cof cok coo cor cos cot crb crc cre crf crk cro crr crs crt csb csc cse csf csk cso csr css cst ctb ctc cte ctf ctk cto ctr cts ctt ebb ebc ebe ebf ebk ebo ebr ebs ebt ec- ecb ecc ece ecf eck eco ecr ecs ect eeb eec eee eef eek eeo eer ees eet ef- efb efc efe eff efo efr efs eft ekb ekc eke ekf eko ekr eks ekt eo- eob eoc eoe eof eok eoo eor eos eot erb erc ere erf erk ero err ers ert es- esb esc ese esf esk eso esr ess est etb etc ete etf etk eto etr ets ett fbb fbc fbe fbf fbk fbo fbr fbs fbt fcb fcc fce fcf fck fco fcr fcs fct feb fec fee fef fek feo fer fes fet ffc ffe fff ffk ffo ffr ffs fft fkb fkc fkf fkk fkt fob foc foe fof fok foo for fos fot frb frc fre frf frk fro frr frs frt fsb fsc fse fsf fsk fso fsr fss fst ftb ftc fte ftf ftk fto ftr fts ftt k-t kbb kbc kbe kbf kbk kbo kbr kbs kcb kcc kce kck kcr kcs kct ke- keb kec kee kef kek keo ker kes ket kfc kff kfo kfs kkb kkc kke kkk kkr kks kkt kob koc koe kof kok koo kor kos kot krc krf krk kro krr krs krt ksb ksc kse ksf ksk kso ksr kss kst ktb ktc kte ktf ktk kto ktr kts ktt ob- obb obc obe obf obk obo obr obs obt oc- ocb occ ocf ock oco ocr ocs oct oeb oec oee oef oeo oer oes oet of- ofb ofc ofe off ofo ofr ofs oft okb okc oke okk oko okr oks oo- oob ooc oof ook ooo oor oos oot or- orb orc ore orf ork oro orr ors ort os- osb osc ose osf osk oso osr oss ost ot- otb otc ote otf otk oto otr ots ott rbb rbc rbe rbf rbk rbo rbr rbs rbt rcb rcc rce rcf rco rcr rcs rct re- reb rec ree ref rek reo rer res ret rfb rfc rfe rff rfk rfo rfr rfs rft rkb rkc rke rkf rkk rko rks rkt rob roc roe rof rok roo ror ros rot rrb rrc rrf rrk rrr rrs rrt rsb rsc rse rsf rsk rso rsr rss rst rtb rtc rte rtf rtk rto rtr rts rtt sbb sbc sbe sbf sbk sbo sbr sbs sbt scb scc sce scf sck sco scr scs sct se- seb sec see sef sek seo ser ses set sfb sfc sfe sff sfk sfo sfr sfs sft sk- skb skc ske skf skk sko skr sks skt sob soc soe sof sok soo sor sos sot sr- srb src sre srf srk sro srr srs srt ss- ssb ssc sse ssf ssk sso ssr sss sst stb stc ste stf stk sto str sts stt tbb tbc tbe tbf tbk tbo tbr tbs tbt tcb tcc tce tcf tck tco tcr tcs tct te- teb tec tee tef tek teo ter tes tet tfb tfc tfe tff tfk tfo tfr tfs tft tkb tkc tke tkk tko tkr tks tkt to- tob toc toe tof tok too tor tos tot trb trc tre trf trk tro trr trs trt tsb tsc tse tsf tsk tso tsr tss tst ttb ttc tte ttf ttk tto ttr tts ttt

-ose bbbb bbbs bbeb bbet bbfc bbrc bcbc bcbs bccc bccs bcec bcer bces bcet bcfc bcof bcor bcos bcrs bcsc bcss bctc bcts bebb bebe bebo beck becs beeb beef beek beer bees beet befe beff befo beft beke beko beks beo- beof beok beor beos beot berc bere berk bero berr bers bert bes- bese besk beso bess best betc bete beto bets bett bfcs bffs bfsr bfts bftt bobb bobe bobo bobs boce bock boco bocs boec boee boef boeo boer boes boet bofe boff bofs boke boko boks boob booc booe boof book boor boos boot bor- bore borf bork boro borr bors bort bosc bose bosk boso boss bost botb bote boto bots bott brcb brce breb brec bree bref brek breo brer bres bret brfc brkb brob broc broe brok broo bror bros brot brrr brrs brsb brsr brst brtc bscs bseb bsec bsee bser bses bset bsfc bsff bsfs bskt bsos bssc bsse bsts btcc btcs btec btek btfc btob btor btrc btrt btss bttb c-bo cbbc cbbs cbcc cbce cbcr cbcs cbct cbec cbee cbef cber cbet cbfb cbfc cbko cbkr cbot cbre cbrt cbsc cbse cbtc cbtf ccbc cccb cccc cccf cccs ccee ccfc ccff ccob ccoc ccrc ccre ccrf ccrs ccrt ccsf ccss ccst cctb cctc cctt cebs cec- cece ceco cecs cect ceeb ceec cees cef- cefc ceke ceor ceos cer- cerc cere cerf cero cers cert cesc cese cesr cess cest cet- cete ceto cets cfbc cfbr cfbs cfbt cfcb cfcf cfco cfcs cffb cffr cfor cfos cfrb cfre cfrt cfse cftc cfte cftk cftr ckbc ckbe ckck ckco ckcs cker ckfr ckob ckoc ckoo ckor ckos ckot ckrc cksb