-er b-u bbb bbc bbe bbg bbk bbn bbr bbs bbt bbu bcb bcc bce bcg bck bcn bcr bcs bct bcu be- beb bec bee beg bek ben ber bes bet beu bgb bgc bge bgg bgk bgn bgr bgs bgt bgu bkb bkc bke bkg bkk bkn bkr bks bkt bnb bnc bne bng bnk bnn bnr bns bnt bnu brb bre brg brk brn brr brs brt bru bsb bsc bse bsg bsk bsn bsr bss bst bsu btb btc bte btg btk btn btr bts btt btu bub buc bue bug buk bun bur bus but buu c-- cbb cbc cbe cbg cbk cbn cbr cbs cbt cbu ccb ccc cce ccg cck ccn ccr ccs cct ccu ce- ceb cec cee ceg cek cen cer ces cet ceu cgb cgc cge cgg cgn cgr cgs cgt cgu ckb ckc cks ckt cn- cnb cnc cne cng cnn cnr cns cnt cnu crb crc cre crg crk crn crr crs crt cru csb csc cse csg csk csn csr css cst csu ctb ctc cte ctg ctk ctn ctr cts ctt ctu cub cuc cue cug cuk cun cur cus cut cuu ebb ebc ebe ebg ebk ebn ebr ebs ebt ebu ec- ecb ecc ece ecg eck ecn ecr ecs ect ecu eeb eec eee eeg eek een eer ees eet egb egc ege egg egn egr egs egt egu ekb ekc eke ekg ekr eks ekt eku en- enb enc ene eng enk enn enr ens ent enu erb erc ere erg erk ern err ers ert eru es- esb esc ese esg esk esn esr ess est esu etb etc ete etg etk etn etr ets ett etu eu- eub euc eue eug eun eur eus eut gbc gbe gbg gbk gbn gbr gbs gbt gbu gcb gcc gce gcg gck gcn gcr gcs gct gcu ge- geb gec gee geg gek gen ger ges get geu ggb ggc ggg ggn ggr ggs ggt ggu gkb gkn gks gkt gnb gnc gne gnn gnr gns gnt gnu grb grc gre grg grk grn grr grs grt gru gsb gsc gse gsg gsk gsn gsr gss gst gsu gtb gtc gte gtg gtk gtn gtr gts gtt gtu gu- gub guc gue gug guk gun gur gus gut guu k-t kbb kbc kbe kbk kbn kbr kbs kbu kcb kcc kce kcg kck kcn kcr kcs kct kcu ke- keb kec kee keg kek ken ker kes ket kgb kgc kgs kgu kkb kkc kke kkk kkn kkr kks kkt kku kn- knc kne kng knk knn knr knt knu krc krg krk krn krr krs krt kru ksb ksc kse ksg ksk ksn ksr kss kst ksu ktb ktc kte ktg ktk ktn ktr kts ktt ktu kub kuc kue kug kuk kun kur kus kut kuu nbb nbc nbe nbg nbk nbn nbr nbs nbt nbu ncb ncc nce ncg nck ncn ncr ncs nct ncu ne- neb nec nee neg nek nen ner nes net neu ngb ngc nge ngg ngk ngn ngs ngt ngu nkc nke nkk nkn nkr nks nkt nku nnb nnc nne nng nnk nnn nns nnt nnu nrb nrc nre nrg nrk nrn nrr nrs nrt nru nsb nsc nse nsg nsk nsn nsr nss nst nsu ntb ntc nte ntg ntk ntn ntr nts ntt ntu nub nuc nue nug nuk nun nur nus nut nuu rbb rbc rbe rbg rbk rbn rbr rbs rbt rbu rcb rcc rce rcg rcn rcr rcs rct rcu re- reb rec ree reg rek ren rer res ret reu rgb rgc rge rgg rgk rgn rgr rgs rgt rkb rkc rke rkg rkk rks rkt rku rnb rnc rng rnn rnr rns rnt rnu rrb rrc rrg rrk rrn rrr rrs rrt rru rsb rsc rse rsg rsk rsn rsr rss rst rsu rtb rtc rte rtg rtk rtn rtr rts rtt rtu rub ruc rue rug ruk run rur rus rut ruu sbb sbc sbe sbg sbk sbn sbr sbs sbt sbu scb scc sce scg sck scn scr scs sct scu se- seb sec see seg sek sen ser ses set seu sgb sgc sge sgg sgk sgn sgr sgs sgt sgu sk- skb skc ske skg skk skr sks skt sku snb snc sne sng snk snn snr sns snt snu sr- srb src sre srg srk srn srr srs srt ss- ssb ssc sse ssg ssk ssn ssr sss sst ssu stb stc ste stg stk stn str sts stt stu sub suc sue sug suk sun sur sus sut suu tbb tbc tbe tbg tbk tbn tbr tbs tbt tbu tcb tcc tce tcg tck tcn tcr tcs tct tcu te- teb tec tee teg tek ten ter tes tet teu tgb tgc tge tgg tgk tgn tgr tgs tgt tgu tkb tkc tke tkg tkk tkr tks tkt tnb tnc tne tng tnk tnn tnr tns tnt trb trc tre trg trk trn trr trs trt tru tsb tsc tse tsg tsk tsn tsr tss tst tsu ttb ttc tte ttg ttk ttn ttr tts ttt ttu tub tuc tue tug tuk tun tur tus tut tuu ubb ubc ube ubg ubk ubn ubr ubs ubt ubu ucb ucc uce ucg uck ucn ucr ucs uct ucu ueb uec uee ueg uen uer ues uet ugb ugc uge ugg ugk ugn ugr ugs ugt ugu ukb ukc uke ukk ukn ukr uku un- unb unc une ung unk unn unr uns unt unu ur- urb urc ure urg urk urn urr urs urt uru usb usc use usg usk usn usr uss ust usu utb utc ute utk utn utr uts utt utu uuc uue uug uun uur uus uut uuu