-er b-u bbb bbc bbe bbk bbr bbs bbt bbu bcb bcc bce bck bcr bcs bct bcu be- beb bec bee bek ber bes bet beu bkb bkc bke bkk bkr bks bkt brb bre brk brr brs brt bru bsb bsc bse bsk bsr bss bst bsu btb btc bte btk btr bts btt btu bub buc bue buk bur bus but buu c-- cbb cbc cbe cbk cbr cbs cbt cbu ccb ccc cce cck ccr ccs cct ccu ce- ceb cec cee cek cer ces cet ceu ckb ckc cks ckt crb crc cre crk crr crs crt cru csb csc cse csk csr css cst csu ctb ctc cte ctk ctr cts ctt ctu cub cuc cue cuk cur cus cut cuu ebb ebc ebe ebk ebr ebs ebt ebu ec- ecb ecc ece eck ecr ecs ect ecu eeb eec eee eek eer ees eet ekb ekc eke ekr eks ekt eku erb erc ere erk err ers ert eru es- esb esc ese esk esr ess est esu etb etc ete etk etr ets ett etu eu- eub euc eue eur eus eut k-t kbb kbc kbe kbk kbr kbs kbu kcb kcc kce kck kcr kcs kct kcu ke- keb kec kee kek ker kes ket kkb kkc kke kkk kkr kks kkt kku krc krk krr krs krt kru ksb ksc kse ksk ksr kss kst ksu ktb ktc kte ktk ktr kts ktt ktu kub kuc kue kuk kur kus kut kuu rbb rbc rbe rbk rbr rbs rbt rbu rcb rcc rce rcr rcs rct rcu re- reb rec ree rek rer res ret reu rkb rkc rke rkk rks rkt rku rrb rrc rrk rrr rrs rrt rru rsb rsc rse rsk rsr rss rst rsu rtb rtc rte rtk rtr rts rtt rtu rub ruc rue ruk rur rus rut ruu sbb sbc sbe sbk sbr sbs sbt sbu scb scc sce sck scr scs sct scu se- seb sec see sek ser ses set seu sk- skb skc ske skk skr sks skt sku sr- srb src sre srk srr srs srt ss- ssb ssc sse ssk ssr sss sst ssu stb stc ste stk str sts stt stu sub suc sue suk sur sus sut suu tbb tbc tbe tbk tbr tbs tbt tbu tcb tcc tce tck tcr tcs tct tcu te- teb tec tee tek ter tes tet teu tkb tkc tke tkk tkr tks tkt trb trc tre trk trr trs trt tru tsb tsc tse tsk tsr tss tst tsu ttb ttc tte ttk ttr tts ttt ttu tub tuc tue tuk tur tus tut tuu ubb ubc ube ubk ubr ubs ubt ubu ucb ucc uce uck ucr ucs uct ucu ueb uec uee uer ues uet ukb ukc uke ukk ukr uku ur- urb urc ure urk urr urs urt uru usb usc use usk usr uss ust usu utb utc ute utk utr uts utt utu uuc uue uur uus uut uuu

bbbb bbbs bbeb bbet bbrc bcbc bcbs bccc bccs bcec bcer bces bcet bcrs bcru bcsc bcss bctc bcts bcuc bebb bebe beck becs becu beeb beek beer bees beet beke beks berc bere berk berr bers bert beru bes- bese besk bess best betc bete bets bett betu beuk beur brcb brce breb brec bree brek brer bres bret brkb brrr brrs brsb brsr brst brtc bruc brue brus brut bscs bseb bsec bsee bser bses bset bskt bssc bsse bsts btcc btcs btec btek btrc btrt btss bttb btus bubb bube bubs bubu bucc buce buck bucs bucu buer bueu buke bukk buku bur- burb bure burk burr burs burt buru busc buse busk buss bust busu but- bute buts butt buus cbbc cbbs cbcc cbce cbcr cbcs cbct cbcu cbec cbee cber cbet cbkr cbre cbrt cbsc cbse cbtc cbus ccbc cccb cccc cccs cccu ccee ccrc ccre ccrs ccrt ccss ccst cctb cctc cctt ccuc ccus ccut cebs cebu cec- cece cecs cect ceeb ceec cees ceke cer- cerc cere cers cert cesc cese cesr cess cest cet- cete cets ckbc ckbe ckck ckcs cker ckrc cksb ckst cktb ckts crbc crbu crcc crce crcr cre- creb crec cree cres cret creu crkc crrt crss crst crtc crts crub crue cruk crus crut cscb cscc csce cscr cscs csec csee cser cset csks csrc csrs csse cssr cstc cstr csts csur csus ctbs ctec ctrc ctrs ctsc ctss ctsu ctts cub- cubb cube cubs cucc cuce cuck cuek cuer cues cuk- cuke curb cure curr curs curt cusb cusk cuss cust cusu cut- cutc cute cuts cutt ebbc ebbr ebbs ebcc eber ebes ebru ebur ebus ecbc ecbe eccb eccc ecce ecct eces ecks ecrc ecrr ecru ecsc ecse ecss ecsu ect- ectc ects ecus eecs eeee eees eeke eeks eerc eers eese eesk eetc eete eets eetu ekeb ekek eker ekes eket ekur erbb erbe ercc erce ereb erec erer eres eret erke erks errc erre errs erse erst erts ertu erub eruc erur erus esbs escb esce escr escs escu esee esek eser eses eset eske esks esku esse esst essu estc este estr ests esus etbc etbr etcc etcs etec etee eter etes etre etsu ette ettu eubc euer eur- eurc eure eurt euse kbbb kbbc kbbe kbbk kbbr kbbs kbbt kbbu kbcb kbce kbck kbcr kbcs kbct kbcu kbeb kbec kbee kbek kber kbes kbet kbkb kbkk kbkr kbrb kbrc kbre kbrk kbrt kbru kbsb kbsk kbsr kbss kbst kbsu kbtb kbtc kbte kbtk kbtr kbts kbtt kbub kbuc kbue kbuk kbur kbus kbut kbuu kcbc kcbk kcbr kcbs kcbu kccb kccc kcck kccr kcct kccu kceb kcec kcee kcet kceu kckc kckk kckr kcrc kcrr kcrs kcrt kcru kcsb kcsc kcse kcsr kcss kcst kcsu kctb kctc kcte kctu kcub kcue kcuk kebb kebc kebe kebr kebt kebu keck kecr keek keer kees keet kekb kekc keke keks keku ker- kerb kerc kere kerk kerr kers kert