-ol bbb bbc bbk bbl bbm bbo bbs bbt bcb bcc bck bcl bcm bco bcs bct bkb bkc bkk bkl bkm bko bks bkt blb blc blk bll blm blo bls blt bmb bmc bmk bml bmm bmo bms bmt bob boc bok bol bom boo bos bot bsb bsc bsk bsl bsm bso bss bst btb btc btk btl btm bto bts btt c-- cbb cbc cbk cbl cbm cbo cbs cbt ccb ccc cck ccl ccm cco ccs cct ckb ckc ckm cko cks ckt cl- clb clc clk cll clm clo cls clt cmb cmc cmk cml cmm cmo cms cmt co- cob coc cok col com coo cos cot csb csc csk csl csm cso css cst ctb ctc ctk ctl ctm cto cts ctt k-t kbb kbc kbk kbl kbm kbo kbs kcb kcc kck kcl kcm kcs kct kkb kkc kkk kkl kkm kks kkt kl- klb klc klm klo kls klt kmb kmc kmk kml kmm kmo kms kmt kob koc kok kol kom koo kos kot ksb ksc ksk ksl ksm kso kss kst ktb ktc ktk ktl ktm kto kts ktt lbb lbc lbk lbl lbm lbo lbs lbt lcb lcc lck lcl lcm lco lcs lct lkb lkl lks lkt llb llc llk lll llm llo lls llt lmb lmc lmk lml lmm lmo lms lmt lob loc lok lol lom loo los lot lsb lsc lsk lsl lsm lso lss lst ltb ltc ltk ltl ltm lto lts ltt m-o mbb mbc mbk mbl mbm mbo mbs mbt mc- mcb mcc mck mcl mcm mco mcs mct mkb mkc mkk mkl mkm mko mks mkt mlb mlc mlk mll mlm mlo mls mlt mmb mmc mmk mml mmm mmo mms mmt mob moc mok mol mom moo mos mot msb msc msk msl msm mso mss mst mtb mtc mtk mtl mtm mto mts mtt ob- obb obc obk obl obm obo obs obt oc- ocb occ ock ocl ocm oco ocs oct okb okc okk okl oko oks olb olc olk oll olm olo ols olt om- omb omc oml omm omo oms omt oo- oob ooc ook ool oom ooo oos oot os- osb osc osk osl osm oso oss ost ot- otb otc otk otl otm oto ots ott sbb sbc sbk sbl sbm sbo sbs sbt scb scc sck scl scm sco scs sct sk- skb skc skk skl skm sko sks skt slb slc slk sll slm slo sls slt smb smc smk sml smm smo sms smt sob soc sok sol som soo sos sot ss- ssb ssc ssk ssl ssm sso sss sst stb stc stk stl stm sto sts stt tbb tbc tbk tbl tbm tbo tbs tbt tcb tcc tck tcl tcm tco tcs tct tkb tkc tkk tkl tkm tko tks tkt tlc tlk tll tlm tlo tls tlt tmb tmc tmk tml tmm tmo tms tmt to- tob toc tok tol tom too tos tot tsb tsc tsk tsl tsm tso tss tst ttb ttc ttk ttl ttm tto tts ttt