-er b-u bbb bbc bbe bbk bbl bbr bbs bbu bcb bcc bce bck bcl bcr bcs bcu be- beb bec bee bek bel ber bes beu bkb bkc bke bkk bkl bkr bks blb blc ble blk bll blr bls blu brb bre brk brl brr brs bru bsb bsc bse bsk bsl bsr bss bsu bub buc bue buk bul bur bus buu c-- cbb cbc cbe cbk cbl cbr cbs cbu ccb ccc cce cck ccl ccr ccs ccu ce- ceb cec cee cek cel cer ces ceu ckb ckc cks cl- clb clc cle clk cll clr cls clu crb crc cre crk crl crr crs cru csb csc cse csk csl csr css csu cub cuc cue cuk cul cur cus cuu ebb ebc ebe ebk ebl ebr ebs ebu ec- ecb ecc ece eck ecl ecr ecs ecu eeb eec eee eek eel eer ees ekb ekc eke ekl ekr eks eku elb elc ele elk ell elr els elu erb erc ere erk erl err ers eru es- esb esc ese esk esl esr ess esu eu- eub euc eue eul eur eus kbb kbc kbe kbk kbl kbr kbs kbu kcb kcc kce kck kcl kcr kcs kcu ke- keb kec kee kek kel ker kes kkb kkc kke kkk kkl kkr kks kku kl- klb klc klr kls klu krc krk krl krr krs kru ksb ksc kse ksk ksl ksr kss ksu kub kuc kue kuk kul kur kus kuu lbb lbc lbe lbk lbl lbr lbs lbu lcb lcc lce lck lcl lcr lcs lcu leb lec lee lek lel ler les leu lkb lkl lkr lks llb llc lle llk lll llr lls llu lrb lrc lrk lrr lrs lru lsb lsc lse lsk lsl lsr lss lsu lub luc lue luk lul lur lus luu rbb rbc rbe rbk rbl rbr rbs rbu rcb rcc rce rcl rcr rcs rcu re- reb rec ree rek rel rer res reu rkb rkc rke rkk rks rku rlc rle rll rlr rls rlu rrb rrc rrk rrl rrr rrs rru rsb rsc rse rsk rsl rsr rss rsu rub ruc rue ruk rur rus ruu sbb sbc sbe sbk sbl sbr sbs sbu scb scc sce sck scl scr scs scu se- seb sec see sek sel ser ses seu sk- skb skc ske skk skl skr sks sku slb slc sle slk sll slr sls slu sr- srb src sre srk srl srr srs ss- ssb ssc sse ssk ssl ssr sss ssu sub suc sue suk sul sur sus suu ubb ubc ube ubk ubl ubr ubs ubu ucb ucc uce uck ucl ucr ucs ucu ueb uec uee uel uer ues ukb ukc uke ukk ukl ukr uku ulb ulc ule ulk ull ulr uls ulu ur- urb urc ure urk url urr urs uru usb usc use usk usl usr uss usu uuc uue uur uus uuu

bbbb bbbs bbeb bblb bbls bbrc bcbc bcbs bccc bccl bccs bcec bcer bces bcrs bcru bcsc bcsl bcss bcuc bebb bebe beck becs becu beeb beek beel beer bees beke beks bele belk bell bels belu berc bere berk berr bers beru bes- bese besk bess beuk beur blcu bleb blee blek bles bleu blkb blls blrc blss blub blue blur blus brcb brce breb brec bree brek brel brer bres brkb brls brrr brrs brsb brsr bruc brue brus bscs bseb bsec bsee bser bses bslc bssc bsse bubb bube bubs bubu bucc buce buck bucs bucu buel buer bueu buke bukk buku bulb bule bulk bull buls bulu bur- burb bure burk burl burr burs buru busc buse busk buss busu buus cbbc cbbs cbcc cbce cbcl cbcr cbcs cbcu cbec cbee cber cbkl cbkr cblb cblc cbre cbrl cbsc cbse cbus ccbc cccb cccc cccl cccs cccu ccee ccel cclc ccls ccrc ccre ccrl ccrs ccsl ccss ccuc ccus cebs cebu cec- cece cecs ceeb ceec ceel cees ceke cel- celc cele cell cels cer- cerc cere cerl cers cesc cese cesr cess ckbc ckbe ckck ckcl ckcs cker ckrc cksb cksl clec clee clek cler cles cleu clrs clsc club clue crbc crbu crcc crce crcr cre- creb crec cree cres creu crkc crkl crls crss crub crue cruk crus cscb cscc csce cscl cscr cscs csec csee cser csks cslr cslu csrc csrs csse cssr csur csus cub- cubb cube cubs cucc cuce cuck cuek cuer cues cuk- cuke culb culc cule culk cull culs curb cure curl curr curs cusb cusk cuss cusu e-cl ebbc ebbr ebbs ebcc ebel eber ebes ebru ebul ebur ebus ecbc ecbe eccb eccc ecce eccl eces ecks ecrc ecrl ecrr ecru ecsc ecse ecss ecsu ecus eecs eeee eees eeke eeks eele eels eerc eers eese eesk ekeb ekek eker ekes ekur el-b elbe elbu elcb elce elec elee elek eler eles elke elks elle ells ellu else elsu elue elul elus erbb erbe ercc erce ereb erec erel erer eres erke erks erle erll errc erre errs erse erub eruc erur erus esbs escb esce escr escs escu esee esek esel eser eses eske esks esku esse essl essu esus eubc euer eule eur- eurc eure euse kbbb kbbc kbbe kbbk kbbl kbbr kbbs kbbu kbcb kbce kbck kbcl kbcr kbcs kbcu kbeb kbec kbee kbek kbel kber kbes kbkb kbkk kbkl kbkr kblb kble kbll kblr kbls kblu kbrb kbrc kbre kbrk kbrl kbru kbsb kbsk kbsr kbss kbsu kbub kbuc kbue kbuk kbul kbur kbus kbuu kcbc kcbk kcbl kcbr kcbs kcbu kccb kccc kcck kccl kccr kccu kceb kcec kcee kcel kceu kckc kckk kckl kckr kclc kcle kclk kcll kclr kcls kclu kcrc kcrr kcrs kcru kcsb kcsc kcse kcsr kcss kcsu kcub kcue kcuk kcul kebb kebc kebe kebr kebu keck kecr keek keel keer kees kekb kekc keke kekl keks keku kele kelk kell kelu ker- kerb kerc kere kerk kerl kerr kers keru kesb kesc kesk kesr