-er -ol bbb bbe bbk bbl bbm bbo bbr bbs bbt be- beb bee bek bel bem beo ber bes bet bkb bke bkk bkl bkm bko bkr bks bkt blb ble blk bll blm blo blr bls blt bmb bme bmk bml bmm bmo bmr bms bmt bob boe bok bol bom boo bor bos bot brb bre brk brl brm bro brr brs brt bsb bse bsk bsl bsm bso bsr bss bst btb bte btk btl btm bto btr bts btt ebb ebe ebk ebl ebm ebo ebr ebs ebt eeb eee eek eel eem eeo eer ees eet ekb eke ekl eko ekr eks ekt elb ele elk ell elm elo elr els elt em- emb eme emk eml emm emo emr ems emt eo- eob eoe eok eol eom eoo eor eos eot erb ere erk erl erm ero err ers ert es- esb ese esk esl esm eso esr ess est etb ete etk etl etm eto etr ets ett k-t kbb kbe kbk kbl kbm kbo kbr kbs ke- keb kee kek kel kem keo ker kes ket kkb kke kkk kkl kkm kkr kks kkt kl- klb klm klo klr kls klt kmb kme kmk kml kmm kmo kms kmt kob koe kok kol kom koo kor kos kot krk krl kro krr krs krt ksb kse ksk ksl ksm kso ksr kss kst ktb kte ktk ktl ktm kto ktr kts ktt lbb lbe lbk lbl lbm lbo lbr lbs lbt leb lee lek lel lem leo ler les let lkb lkl lkr lks lkt llb lle llk lll llm llo llr lls llt lmb lme lmk lml lmm lmo lmr lms lmt lob loe lok lol lom loo lor los lot lrb lrk lrm lro lrr lrs lrt lsb lse lsk lsl lsm lso lsr lss lst ltb lte ltk ltl ltm lto ltr lts ltt m-o m-r mbb mbe mbk mbl mbm mbo mbr mbs mbt meb mee mek mel mem meo mer mes met mkb mke mkk mkl mkm mko mkr mks mkt mlb mle mlk mll mlm mlo mlr mls mlt mmb mme mmk mml mmm mmo mmr mms mmt mob moe mok mol mom moo mor mos mot mrb mre mrk mrl mrm mro mrr mrs mrt msb mse msk msl msm mso msr mss mst mtb mte mtk mtl mtm mto mtr mts mtt ob- obb obe obk obl obm obo obr obs obt oeb oee oel oem oeo oer oes oet okb oke okk okl oko okr oks olb ole olk oll olm olo ols olt om- omb ome oml omm omo omr oms omt oo- oob ook ool oom ooo oor oos oot or- orb ore ork orl orm oro orr ors ort os- osb ose osk osl osm oso osr oss ost ot- otb ote otk otl otm oto otr ots ott rbb rbe rbk rbl rbm rbo rbr rbs rbt re- reb ree rek rel rem reo rer res ret rkb rke rkk rkm rko rks rkt rle rll rlm rlo rlr rls rlt rmb rme rml rmm rmo rmr rms rmt rob roe rok rol rom roo ror ros rot rrb rrk rrl rrm rrr rrs rrt rsb rse rsk rsl rsm rso rsr rss rst rtb rte rtk rtl rtm rto rtr rts rtt sbb sbe sbk sbl sbm sbo sbr sbs sbt se- seb see sek sel sem seo ser ses set sk- skb ske skk skl skm sko skr sks skt slb sle slk sll slm slo slr sls slt smb sme smk sml smm smo smr sms smt sob soe sok sol som soo sor sos sot sr- srb sre srk srl srm sro srr srs srt ss- ssb sse ssk ssl ssm sso ssr sss sst stb ste stk stl stm sto str sts stt tbb tbe tbk tbl tbm tbo tbr tbs tbt te- teb tee tek tel tem teo ter tes tet tkb tke tkk tkl tkm tko tkr tks tkt tle tlk tll tlm tlo tlr tls tlt tmb tme tmk tml tmm tmo tmr tms tmt to- tob toe tok tol tom too tor tos tot trb tre trk trl trm tro trr trs trt tsb tse tsk tsl tsm tso tsr tss tst ttb tte ttk ttl ttm tto ttr tts ttt