-er -ol b-u bbb bbc bbe bbk bbl bbm bbo bbr bbs bbt bbu bcb bcc bce bck bcl bcm bco bcr bcs bct bcu be- beb bec bee bek bel bem beo ber bes bet beu bkb bkc bke bkk bkl bkm bko bkr bks bkt blb blc ble blk bll blm blo blr bls blt blu bmb bmc bme bmk bml bmm bmo bmr bms bmt bmu bob boc boe bok bol bom boo bor bos bot bou brb bre brk brl brm bro brr brs brt bru bsb bsc bse bsk bsl bsm bso bsr bss bst bsu btb btc bte btk btl btm bto btr bts btt btu bub buc bue buk bul bum buo bur bus but buu c-- cbb cbc cbe cbk cbl cbm cbo cbr cbs cbt cbu ccb ccc cce cck ccl ccm cco ccr ccs cct ccu ce- ceb cec cee cek cel cem ceo cer ces cet ceu ckb ckc ckm cko cks ckt cl- clb clc cle clk cll clm clo clr cls clt clu cmb cmc cme cmk cml cmm cmo cmr cms cmt cmu co- cob coc coe cok col com coo cor cos cot cou crb crc cre crk crl crm cro crr crs crt cru csb csc cse csk csl csm cso csr css cst csu ctb ctc cte ctk ctl ctm cto ctr cts ctt ctu cub cuc cue cuk cul cum cuo cur cus cut cuu ebb ebc ebe ebk ebl ebm ebo ebr ebs ebt ebu ec- ecb ecc ece eck ecl ecm eco ecr ecs ect ecu eeb eec eee eek eel eem eeo eer ees eet ekb ekc eke ekl eko ekr eks ekt eku elb elc ele elk ell elm elo elr els elt elu em- emb emc eme emk eml emm emo emr ems emt emu eo- eob eoc eoe eok eol eom eoo eor eos eot eou erb erc ere erk erl erm ero err ers ert eru es- esb esc ese esk esl esm eso esr ess est esu etb etc ete etk etl etm eto etr ets ett etu eu- eub euc eue eul eur eus eut k-t kbb kbc kbe kbk kbl kbm kbo kbr kbs kbu kcb kcc kce kck kcl kcm kcr kcs kct kcu ke- keb kec kee kek kel kem keo ker kes ket kkb kkc kke kkk kkl kkm kkr kks kkt kku kl- klb klc klm klo klr kls klt klu kmb kmc kme kmk kml kmm kmo kms kmt kmu kob koc koe kok kol kom koo kor kos kot kou krc krk krl kro krr krs krt kru ksb ksc kse ksk ksl ksm kso ksr kss kst ksu ktb ktc kte ktk ktl ktm kto ktr kts ktt ktu kub kuc kue kuk kul kum kur kus kut kuu lbb lbc lbe lbk lbl lbm lbo lbr lbs lbt lbu lcb lcc lce lck lcl lcm lco lcr lcs lct lcu leb lec lee lek lel lem leo ler les let leu lkb lkl lkr lks lkt llb llc lle llk lll llm llo llr lls llt llu lmb lmc lme lmk lml lmm lmo lmr lms lmt lmu lob loc loe lok lol lom loo lor los lot lou lrb lrc lrk lrm lro lrr lrs lrt lru lsb lsc lse lsk lsl lsm lso lsr lss lst lsu ltb ltc lte ltk ltl ltm lto ltr lts ltt ltu lub luc lue luk lul lum luo lur lus lut luu m-o m-r mbb mbc mbe mbk mbl mbm mbo mbr mbs mbt mbu mc- mcb mcc mce mck mcl mcm mco mcr mcs mct mcu meb mec mee mek mel mem meo mer mes met meu mkb mkc mke mkk mkl mkm mko mkr mks mkt mku mlb mlc mle mlk mll mlm mlo mlr mls mlt mlu mmb mmc mme mmk mml mmm mmo mmr mms mmt mmu mob moc moe mok mol mom moo mor mos mot mou mrb mrc mre mrk mrl mrm mro mrr mrs mrt mru msb msc mse msk msl msm mso msr mss mst msu mtb mtc mte mtk mtl mtm mto mtr mts mtt mtu mub muc mue muk mul mum mur mus mut muu ob- obb obc obe obk obl obm obo obr obs obt obu oc- ocb occ ock ocl ocm oco ocr ocs oct ocu oeb oec oee oel oem oeo oer oes oet okb okc oke okk okl oko okr oks oku olb olc ole olk oll olm olo ols olt olu om- omb omc ome oml omm omo omr oms omt omu oo- oob ooc ook ool oom ooo oor oos oot or- orb orc ore ork orl orm oro orr ors ort oru os- osb osc ose osk osl osm oso osr oss ost osu ot- otb otc ote otk otl otm oto otr ots ott otu ou- ouc oue ouk oul oum ouo our ous out rbb rbc rbe rbk rbl rbm rbo rbr rbs rbt rbu rcb rcc rce rcl rcm rco rcr rcs rct rcu re- reb rec ree rek rel rem reo rer res ret reu rkb rkc rke rkk rkm rko rks rkt rku rlc rle rll rlm rlo rlr rls rlt rlu rmb rmc rme rml rmm rmo rmr rms rmt rob roc roe rok rol rom roo ror ros rot rou rrb rrc rrk rrl rrm rrr rrs rrt rru rsb rsc rse rsk rsl rsm rso rsr rss rst rsu rtb rtc rte rtk rtl rtm rto rtr rts rtt rtu rub ruc rue ruk rum ruo rur rus rut ruu sbb sbc sbe sbk sbl sbm sbo sbr sbs sbt sbu scb scc sce sck scl scm sco scr scs sct scu se- seb sec see sek sel sem seo ser ses set seu sk- skb skc ske skk skl skm sko skr sks skt sku slb slc sle slk sll slm slo slr sls slt slu smb smc sme