-er bbb bbc bbe bbg bbh bbk bbn bbo bbr bbs bcb bcc bce bcg bch bck bcn bco bcr bcs be- beb bec bee beg beh bek ben beo ber bes bgb bgc bge bgg bgh bgk bgn bgo bgr bgs bhb bhc bhe bhg bhh bhk bho bhr bhs bkb bkc bke bkg bkk bkn bko bkr bks bnb bnc bne bng bnk bnn bno bnr bns bob boc boe bog boh bok bon boo bor bos brb bre brg brh brk brn bro brr brs bsb bsc bse bsg bsh bsk bsn bso bsr bss c-- cbb cbc cbe cbg cbh cbk cbn cbo cbr cbs ccb ccc cce ccg cch cck ccn cco ccr ccs ce- ceb cec cee ceg ceh cek cen ceo cer ces cgb cgc cge cgg cgh cgn cgo cgr cgs ch- chb chc che chg chh chk chn cho chr chs ckb ckc ckh cko cks cn- cnb cnc cne cng cnh cnn cno cnr cns co- cob coc coe cog coh cok con coo cor cos crb crc cre crg crh crk crn cro crr crs csb csc cse csg csh csk csn cso csr css ebb ebc ebe ebg ebh ebk ebn ebo ebr ebs ec- ecb ecc ece ecg ech eck ecn eco ecr ecs eeb eec eee eeg eek een eeo eer ees egb egc ege egg egh egn ego egr egs ehb ehc ehe ehg ehh ehn eho ehr ehs ekb ekc eke ekg ekh eko ekr eks en- enb enc ene eng enh enk enn eno enr ens eo- eob eoc eoe eog eoh eok eon eoo eor eos erb erc ere erg erh erk ern ero err ers es- esb esc ese esg esh esk esn eso esr ess gbc gbe gbg gbh gbk gbn gbo gbr gbs gcb gcc gce gcg gch gck gcn gco gcr gcs ge- geb gec gee geg geh gek gen geo ger ges ggb ggc ggg ggh ggn ggo ggr ggs ghb ghc ghe ghg ghh ghn gho ghr ghs gkb gkh gkn gko gks gnb gnc gne gnn gno gnr gns gob goc goe gog goh gok gon goo gor gos grb grc gre grg grh grk grn gro grr grs gsb gsc gse gsg gsk gsn gso gsr gss hbb hbc hbe hbg hbh hbk hbn hbo hbr hbs hcb hcc hce hcg hch hck hcn hco hcr hcs he- heb hec hee heg heh hek hen heo her hes hgb hgc hge hgg hgh hgk hgn hgo hgr hgs hhb hhc hhe hhg hhh hhk hhn hho hhr hhs hkb hkg hkh hkk hkn hko hkr hks hnb hnc hne hng hnh hnk hnn hno hns hob hoc hoe hog hoh hok hon hoo hor hos hr- hrb hrc hre hrg hrh hrk hrn hro hrr hrs hsb hsc hse hsg hsh hsk hsn hsr hss kbb kbc kbe kbh kbk kbn kbo kbr kbs kcb kcc kce kcg kch kck kcn kcr kcs ke- keb kec kee keg keh kek ken keo ker kes kgb kgc kgh kgo kgs khe khh khk khn kho khr khs kkb kkc kke kkh kkk kkn kkr kks kn- knc kne kng knk knn kno knr kob koc koe kog koh kok kon koo kor kos krc krg krk krn kro krr krs ksb ksc kse ksg ksh ksk ksn kso ksr kss nbb nbc nbe nbg nbk nbn nbo nbr nbs ncb ncc nce ncg nch nck ncn nco ncr ncs ne- neb nec nee neg neh nek nen neo ner nes ngb ngc nge ngg ngh ngk ngn ngo ngs nhb nhc nhe nhg nhh nhk nhn nhr nhs nkc nke nkk nkn nko nkr nks nnb nnc nne nng nnh nnk nnn nno nns no- nob noc noe nog noh nok non noo nor nos nrb nrc nre nrg nrk nrn nro nrr nrs nsb nsc nse nsg nsh nsk nsn nso nsr nss ob- obb obc obe obg obh obk obn obo obr obs oc- ocb occ ocg och ock ocn oco ocr ocs oeb oec oee oeg oeh oen oeo oer oes ogc oge ogg ogh ogn ogo ogs ohc ohe ohg ohh ohn oho ohr ohs okb okc oke okg okk oko okr oks on- onb onc one ong onh onk onn ono onr ons oo- oob ooc oog ooh ook oon ooo oor oos or- orb orc ore org orh ork orn oro orr ors os- osb osc ose osg osh osk osn oso osr oss rbb rbc rbe rbg rbh rbk rbn rbo rbr rbs rcb rcc rce rcg rch rcn rco rcr rcs re- reb rec ree reg reh rek ren reo rer res rgb rgc rge rgg rgh rgk rgn rgo rgr rgs rh- rhb rhc rhe rhg rhh rhn rho rhr rhs rkb rkc rke rkg rkk rko rks rnb rnc rng rnh rnn rno rnr rns rob roc roe rog roh rok ron roo ror ros rrb rrc rrg rrh rrk rrn rrr rrs rsb rsc rse rsg rsh rsk rsn rso rsr rss sbb sbc sbe sbg sbh sbk sbn sbo sbr sbs scb scc sce scg sch sck scn sco scr scs se- seb sec see seg seh sek sen seo ser ses sgb sgc sge sgg sgh sgk sgn sgo sgr sgs sh- shb shc she shg shh shk shn sho shr shs sk- skb skc ske skg skh skk sko skr sks snb snc sne sng snk snn sno snr sns sob soc soe sog soh sok son soo sor sos sr- srb src sre srg srh srk srn sro srr srs ss- ssb ssc sse ssg ssh ssk ssn sso ssr sss