-er b-u bbb bbc bbe bbg bbk bbl bbr bbs bbt bbu bcb bcc bce bcg bck bcl bcr bcs bct bcu be- beb bec bee beg bek bel ber bes bet beu bgb bgc bge bgg bgk bgl bgr bgs bgt bgu bkb bkc bke bkg bkk bkl bkr bks bkt blb blc ble blg blk bll blr bls blt blu brb bre brg brk brl brr brs brt bru bsb bsc bse bsg bsk bsl bsr bss bst bsu btb btc bte btg btk btl btr bts btt btu bub buc bue bug buk bul bur bus but buu c-- cbb cbc cbe cbg cbk cbl cbr cbs cbt cbu ccb ccc cce ccg cck ccl ccr ccs cct ccu ce- ceb cec cee ceg cek cel cer ces cet ceu cgb cgc cge cgg cgl cgr cgs cgt cgu ckb ckc cks ckt cl- clb clc cle clg clk cll clr cls clt clu crb crc cre crg crk crl crr crs crt cru csb csc cse csg csk csl csr css cst csu ctb ctc cte ctg ctk ctl ctr cts ctt ctu cub cuc cue cug cuk cul cur cus cut cuu ebb ebc ebe ebg ebk ebl ebr ebs ebt ebu ec- ecb ecc ece ecg eck ecl ecr ecs ect ecu eeb eec eee eeg eek eel eer ees eet egb egc ege egg egl egr egs egt egu ekb ekc eke ekg ekl ekr eks ekt eku elb elc ele elg elk ell elr els elt elu erb erc ere erg erk erl err ers ert eru es- esb esc ese esg esk esl esr ess est esu etb etc ete etg etk etl etr ets ett etu eu- eub euc eue eug eul eur eus eut gbc gbe gbg gbk gbl gbr gbs gbt gbu gcb gcc gce gcg gck gcl gcr gcs gct gcu ge- geb gec gee geg gek gel ger ges get geu ggb ggc ggg ggr ggs ggt ggu gkb gks gkt glb glc gle glg glk gll glr gls glt glu grb grc gre grg grk grl grr grs grt gru gsb gsc gse gsg gsk gsl gsr gss gst gsu gtb gtc gte gtg gtk gtl gtr gts gtt gtu gu- gub guc gue gug guk gul gur gus gut guu k-t kbb kbc kbe kbk kbl kbr kbs kbu kcb kcc kce kcg kck kcl kcr kcs kct kcu ke- keb kec kee keg kek kel ker kes ket kgb kgc kgl kgs kgu kkb kkc kke kkk kkl kkr kks kkt kku kl- klb klc klg klr kls klt klu krc krg krk krl krr krs krt kru ksb ksc kse ksg ksk ksl ksr kss kst ksu ktb ktc kte ktg ktk ktl ktr kts ktt ktu kub kuc kue kug kuk kul kur kus kut kuu lbb lbc lbe lbg lbk lbl lbr lbs lbt lbu lcb lcc lce lcg lck lcl lcr lcs lct lcu leb lec lee leg lek lel ler les let leu lgb lgc lge lgg lgk lgl lgr lgs lgt lgu lkb lkg lkl lkr lks lkt llb llc lle llg llk lll llr lls llt llu lrb lrc lrg lrk lrr lrs lrt lru lsb lsc lse lsg lsk lsl lsr lss lst lsu ltb ltc lte ltg ltk ltl ltr lts ltt ltu lub luc lue lug luk lul lur lus lut luu rbb rbc rbe rbg rbk rbl rbr rbs rbt rbu rcb rcc rce rcg rcl rcr rcs rct rcu re- reb rec ree reg rek rel rer res ret reu rgb rgc rge rgg rgk rgr rgs rgt rkb rkc rke rkg rkk rks rkt rku rlc rle rlg rll rlr rls rlt rlu rrb rrc rrg rrk rrl rrr rrs rrt rru rsb rsc rse rsg rsk rsl rsr rss rst rsu rtb rtc rte rtg rtk rtl rtr rts rtt rtu rub ruc rue rug ruk rur rus rut ruu sbb sbc sbe sbg sbk sbl sbr sbs sbt sbu scb scc sce scg sck scl scr scs sct scu se- seb sec see seg sek sel ser ses set seu sgb sgc sge sgg sgk sgl sgr sgs sgt sgu sk- skb skc ske skg skk skl skr sks skt sku slb slc sle slg slk sll slr sls slt slu sr- srb src sre srg srk srl srr srs srt ss- ssb ssc sse ssg ssk ssl ssr sss sst ssu stb stc ste stg stk stl str sts stt stu sub suc sue sug suk sul sur sus sut suu tbb tbc tbe tbg tbk tbl tbr tbs tbt tbu tcb tcc tce tcg tck tcl tcr tcs tct tcu te- teb tec tee teg tek tel ter tes tet teu tgb tgc tge tgg tgk tgl tgr tgs tgt tgu tkb tkc tke tkg tkk tkl tkr tks tkt tlc tle tlg tlk tll tlr tls tlt tlu trb trc tre trg trk trl trr trs trt tru tsb tsc tse tsg tsk tsl tsr tss tst tsu ttb ttc tte ttg ttk ttl ttr tts ttt ttu tub tuc tue tug tuk tul tur tus tut tuu ubb ubc ube ubg ubk ubl ubr ubs ubt ubu ucb ucc uce ucg uck ucl ucr ucs uct ucu ueb uec uee ueg uel uer ues uet ugb ugc uge ugg ugk ugl ugr ugs ugt ugu ukb ukc uke ukk ukl ukr uku ulb ulc ule ulg ulk ull ulr uls ult ulu ur- urb urc ure urg urk url urr urs urt uru usb usc use usg usk usl usr uss ust usu utb utc ute utk utl utr uts utt utu uuc uue uug uur uus uut uuu