-er bbb bbc bbe bbg bbh bbk bbo bbr bbs bcb bcc bce bcg bch bck bco bcr bcs be- beb bec bee beg beh bek beo ber bes bgb bgc bge bgg bgh bgk bgo bgr bgs bhb bhc bhe bhg bhh bhk bho bhr bhs bkb bkc bke bkg bkk bko bkr bks bob boc boe bog boh bok boo bor bos brb bre brg brh brk bro brr brs bsb bsc bse bsg bsh bsk bso bsr bss c-- cbb cbc cbe cbg cbh cbk cbo cbr cbs ccb ccc cce ccg cch cck cco ccr ccs ce- ceb cec cee ceg ceh cek ceo cer ces cgb cgc cge cgg cgh cgo cgr cgs ch- chb chc che chg chh chk cho chr chs ckb ckc ckh cko cks co- cob coc coe cog coh cok coo cor cos crb crc cre crg crh crk cro crr crs csb csc cse csg csh csk cso csr css ebb ebc ebe ebg ebh ebk ebo ebr ebs ec- ecb ecc ece ecg ech eck eco ecr ecs eeb eec eee eeg eek eeo eer ees egb egc ege egg egh ego egr egs ehb ehc ehe ehg ehh eho ehr ehs ekb ekc eke ekg ekh eko ekr eks eo- eob eoc eoe eog eoh eok eoo eor eos erb erc ere erg erh erk ero err ers es- esb esc ese esg esh esk eso esr ess gbc gbe gbg gbh gbk gbo gbr gbs gcb gcc gce gcg gch gck gco gcr gcs ge- geb gec gee geg geh gek geo ger ges ggb ggc ggg ggh ggo ggr ggs ghb ghc ghe ghg ghh gho ghr ghs gkb gkh gko gks gob goc goe gog goh gok goo gor gos grb grc gre grg grh grk gro grr grs gsb gsc gse gsg gsk gso gsr gss hbb hbc hbe hbg hbh hbk hbo hbr hbs hcb hcc hce hcg hch hck hco hcr hcs he- heb hec hee heg heh hek heo her hes hgb hgc hge hgg hgh hgk hgo hgr hgs hhb hhc hhe hhg hhh hhk hho hhr hhs hkb hkg hkh hkk hko hkr hks hob hoc hoe hog hoh hok hoo hor hos hr- hrb hrc hre hrg hrh hrk hro hrr hrs hsb hsc hse hsg hsh hsk hsr hss kbb kbc kbe kbh kbk kbo kbr kbs kcb kcc kce kcg kch kck kcr kcs ke- keb kec kee keg keh kek keo ker kes kgb kgc kgh kgo kgs khe khh khk kho khr khs kkb kkc kke kkh kkk kkr kks kob koc koe kog koh kok koo kor kos krc krg krk kro krr krs ksb ksc kse ksg ksh ksk kso ksr kss ob- obb obc obe obg obh obk obo obr obs oc- ocb occ ocg och ock oco ocr ocs oeb oec oee oeg oeh oeo oer oes ogc oge ogg ogh ogo ogs ohc ohe ohg ohh oho ohr ohs okb okc oke okg okk oko okr oks oo- oob ooc oog ooh ook ooo oor oos or- orb orc ore org orh ork oro orr ors os- osb osc ose osg osh osk oso osr oss rbb rbc rbe rbg rbh rbk rbo rbr rbs rcb rcc rce rcg rch rco rcr rcs re- reb rec ree reg reh rek reo rer res rgb rgc rge rgg rgh rgk rgo rgr rgs rh- rhb rhc rhe rhg rhh rho rhr rhs rkb rkc rke rkg rkk rko rks rob roc roe rog roh rok roo ror ros rrb rrc rrg rrh rrk rrr rrs rsb rsc rse rsg rsh rsk rso rsr rss sbb sbc sbe sbg sbh sbk sbo sbr sbs scb scc sce scg sch sck sco scr scs se- seb sec see seg seh sek seo ser ses sgb sgc sge sgg sgh sgk sgo sgr sgs sh- shb shc she shg shh shk sho shr shs sk- skb skc ske skg skh skk sko skr sks sob soc soe sog soh sok soo sor sos sr- srb src sre srg srh srk sro srr srs ss- ssb ssc sse ssg ssh ssk sso ssr sss