-er b-u bbb bbc bbe bbg bbk bbn bbo bbr bbs bbt bbu bcb bcc bce bcg bck bcn bco bcr bcs bct bcu be- beb bec bee beg bek ben beo ber bes bet beu bgb bgc bge bgg bgk bgn bgo bgr bgs bgt bgu bkb bkc bke bkg bkk bkn bko bkr bks bkt bnb bnc bne bng bnk bnn bno bnr bns bnt bnu bob boc boe bog bok bon boo bor bos bot bou brb bre brg brk brn bro brr brs brt bru bsb bsc bse bsg bsk bsn bso bsr bss bst bsu btb btc bte btg btk btn bto btr bts btt btu bub buc bue bug buk bun buo bur bus but buu c-- cbb cbc cbe cbg cbk cbn cbo cbr cbs cbt cbu ccb ccc cce ccg cck ccn cco ccr ccs cct ccu ce- ceb cec cee ceg cek cen ceo cer ces cet ceu cgb cgc cge cgg cgn cgo cgr cgs cgt cgu ckb ckc cko cks ckt cn- cnb cnc cne cng cnn cno cnr cns cnt cnu co- cob coc coe cog cok con coo cor cos cot cou crb crc cre crg crk crn cro crr crs crt cru csb csc cse csg csk csn cso csr css cst csu ctb ctc cte ctg ctk ctn cto ctr cts ctt ctu cub cuc cue cug cuk cun cuo cur cus cut cuu ebb ebc ebe ebg ebk ebn ebo ebr ebs ebt ebu ec- ecb ecc ece ecg eck ecn eco ecr ecs ect ecu eeb eec eee eeg eek een eeo eer ees eet egb egc ege egg egn ego egr egs egt egu ekb ekc eke ekg eko ekr eks ekt eku en- enb enc ene eng enk enn eno enr ens ent enu eo- eob eoc eoe eog eok eon eoo eor eos eot eou erb erc ere erg erk ern ero err ers ert eru es- esb esc ese esg esk esn eso esr ess est esu etb etc ete etg etk etn eto etr ets ett etu eu- eub euc eue eug eun eur eus eut gbc gbe gbg gbk gbn gbo gbr gbs gbt gbu gcb gcc gce gcg gck gcn gco gcr gcs gct gcu ge- geb gec gee geg gek gen geo ger ges get geu ggb ggc ggg ggn ggo ggr ggs ggt ggu gkb gkn gko gks gkt gnb gnc gne gnn gno gnr gns gnt gnu gob goc goe gog gok gon goo gor gos got gou grb grc gre grg grk grn gro grr grs grt gru gsb gsc gse gsg gsk gsn gso gsr gss gst gsu gtb gtc gte gtg gtk gtn gto gtr gts gtt gtu gu- gub guc gue gug guk gun guo gur gus gut guu k-t kbb kbc kbe kbk kbn kbo kbr kbs kbu kcb kcc kce kcg kck kcn kcr kcs kct kcu ke- keb kec kee keg kek ken keo ker kes ket kgb kgc kgo kgs kgu kkb kkc kke kkk kkn kkr kks kkt kku kn- knc kne kng knk knn kno knr knt knu kob koc koe kog kok kon koo kor kos kot kou krc krg krk krn kro krr krs krt kru ksb ksc kse ksg ksk ksn kso ksr kss kst ksu ktb ktc kte ktg ktk ktn kto ktr kts ktt ktu kub kuc kue kug kuk kun kur kus kut kuu nbb nbc nbe nbg nbk nbn nbo nbr nbs nbt nbu ncb ncc nce ncg nck ncn nco ncr ncs nct ncu ne- neb nec nee neg nek nen neo ner nes net neu ngb ngc nge ngg ngk ngn ngo ngs ngt ngu nkc nke nkk nkn nko nkr nks nkt nku nnb nnc nne nng nnk nnn nno nns nnt nnu no- nob noc noe nog nok non noo nor nos not nou nrb nrc nre nrg nrk nrn nro nrr nrs nrt nru nsb nsc nse nsg nsk nsn nso nsr nss nst nsu ntb ntc nte ntg ntk ntn nto ntr nts ntt ntu nub nuc nue nug nuk nun nuo nur nus nut nuu ob- obb obc obe obg obk obn obo obr obs obt obu oc- ocb occ ocg ock ocn oco ocr ocs oct ocu oeb oec oee oeg oen oeo oer oes oet ogc oge ogg ogn ogo ogs ogt okb okc oke okg okk oko okr oks oku on- onb onc one ong onk onn ono onr ons ont onu oo- oob ooc oog ook oon ooo oor oos oot or- orb orc ore org ork orn oro orr ors ort oru os- osb osc ose osg osk osn oso osr oss ost osu ot- otb otc ote otg otk otn oto otr ots ott otu ou- ouc oue ouk oun ouo our ous out rbb rbc rbe rbg rbk rbn rbo rbr rbs rbt rbu rcb rcc rce rcg rcn rco rcr rcs rct rcu re- reb rec ree reg rek ren reo rer res ret reu rgb rgc rge rgg rgk rgn rgo rgr rgs rgt rkb rkc rke rkg rkk rko rks rkt rku rnb rnc rng rnn rno rnr rns rnt rnu rob roc roe rog rok ron roo ror ros rot rou rrb rrc rrg rrk rrn rrr rrs rrt rru rsb rsc rse rsg rsk rsn rso rsr rss rst rsu rtb rtc rte rtg rtk rtn rto rtr rts rtt rtu rub ruc rue rug ruk run ruo rur rus rut ruu sbb sbc sbe sbg sbk sbn sbo sbr sbs sbt sbu scb scc sce scg sck scn sco scr scs sct scu se- seb sec see seg sek sen seo ser ses set seu sgb sgc sge sgg sgk sgn sgo sgr sgs sgt sgu sk- skb skc ske skg skk sko skr sks skt sku snb snc sne sng snk snn sno snr sns snt snu sob soc soe sog sok son soo sor