-ol bbb bbe bbk bbl bbm bbo bbs bbt be- beb bee bek bel bem beo bes bet bkb bke bkk bkl bkm bko bks bkt blb ble blk bll blm blo bls blt bmb bme bmk bml bmm bmo bms bmt bob boe bok bol bom boo bos bot bsb bse bsk bsl bsm bso bss bst btb bte btk btl btm bto bts btt ebb ebe ebk ebl ebm ebo ebs ebt eeb eee eek eel eem eeo ees eet ekb eke ekl eko eks ekt elb ele elk ell elm elo els elt em- emb eme emk eml emm emo ems emt eo- eob eoe eok eol eom eoo eos eot es- esb ese esk esl esm eso ess est etb ete etk etl etm eto ets ett k-t kbb kbe kbk kbl kbm kbo kbs ke- keb kee kek kel kem keo kes ket kkb kke kkk kkl kkm kks kkt kl- klb klm klo kls klt kmb kme kmk kml kmm kmo kms kmt kob koe kok kol kom koo kos kot ksb kse ksk ksl ksm kso kss kst ktb kte ktk ktl ktm kto kts ktt lbb lbe lbk lbl lbm lbo lbs lbt leb lee lek lel lem leo les let lkb lkl lks lkt llb lle llk lll llm llo lls llt lmb lme lmk lml lmm lmo lms lmt lob loe lok lol lom loo los lot lsb lse lsk lsl lsm lso lss lst ltb lte ltk ltl ltm lto lts ltt m-o mbb mbe mbk mbl mbm mbo mbs mbt meb mee mek mel mem meo mes met mkb mke mkk mkl mkm mko mks mkt mlb mle mlk mll mlm mlo mls mlt mmb mme mmk mml mmm mmo mms mmt mob moe mok mol mom moo mos mot msb mse msk msl msm mso mss mst mtb mte mtk mtl mtm mto mts mtt ob- obb obe obk obl obm obo obs obt oeb oee oel oem oeo oes oet okb oke okk okl oko oks olb ole olk oll olm olo ols olt om- omb ome oml omm omo oms omt oo- oob ook ool oom ooo oos oot os- osb ose osk osl osm oso oss ost ot- otb ote otk otl otm oto ots ott sbb sbe sbk sbl sbm sbo sbs sbt se- seb see sek sel sem seo ses set sk- skb ske skk skl skm sko sks skt slb sle slk sll slm slo sls slt smb sme smk sml smm smo sms smt sob soe sok sol som soo sos sot ss- ssb sse ssk ssl ssm sso sss sst stb ste stk stl stm sto sts stt tbb tbe tbk tbl tbm tbo tbs tbt te- teb tee tek tel tem teo tes tet tkb tke tkk tkl tkm tko tks tkt tle tlk tll tlm tlo tls tlt tmb tme tmk tml tmm tmo tms tmt to- tob toe tok tol tom too tos tot tsb tse tsk tsl tsm tso tss tst ttb tte ttk ttl ttm tto tts ttt