-ol bbb bbc bbk bbl bbm bbn bbo bbs bcb bcc bck bcl bcm bcn bco bcs bkb bkc bkk bkl bkm bkn bko bks blb blc blk bll blm bln blo bls bmb bmc bmk bml bmm bmn bmo bms bnb bnc bnk bnl bnn bno bns bob boc bok bol bom bon boo bos bsb bsc bsk bsl bsm bsn bso bss c-- cbb cbc cbk cbl cbm cbn cbo cbs ccb ccc cck ccl ccm ccn cco ccs ckb ckc ckm cko cks cl- clb clc clk cll clm cln clo cls cmb cmc cmk cml cmm cmn cmo cms cn- cnb cnc cnl cnm cnn cno cns co- cob coc cok col com con coo cos csb csc csk csl csm csn cso css kbb kbc kbk kbl kbm kbn kbo kbs kcb kcc kck kcl kcm kcn kcs kkb kkc kkk kkl kkm kkn kks kl- klb klc klm klo kls kmb kmc kmk kml kmm kmo kms kn- knc knk knl knm knn kno kob koc kok kol kom kon koo kos ksb ksc ksk ksl ksm ksn kso kss lbb lbc lbk lbl lbm lbo lbs lcb lcc lck lcl lcm lcn lco lcs lkb lkl lks llb llc llk lll llm lln llo lls lmb lmc lmk lml lmm lmn lmo lms lnb lnc lnk lnl lnm lnn lno lns lob loc lok lol lom lon loo los lsb lsc lsk lsl lsm lsn lso lss m-o mbb mbc mbk mbl mbm mbo mbs mc- mcb mcc mck mcl mcm mcn mco mcs mkb mkc mkk mkl mkm mkn mko mks mlb mlc mlk mll mlm mln mlo mls mmb mmc mmk mml mmm mmn mmo mms mnb mnc mnk mnl mnm mnn mno mns mob moc mok mol mom mon moo mos msb msc msk msl msm msn mso mss nbb nbc nbk nbl nbm nbn nbo nbs ncb ncc nck ncl ncm ncn nco ncs nkc nkk nkm nkn nko nks nlb nlc nlk nll nlm nln nlo nls nmb nmc nmk nml nmm nmn nmo nms nnb nnc nnk nnl nnm nnn nno nns no- nob noc nok nol nom non noo nos nsb nsc nsk nsl nsm nsn nso nss ob- obb obc obk obl obm obn obo obs oc- ocb occ ock ocl ocm ocn oco ocs okb okc okk okl oko oks olb olc olk oll olm oln olo ols om- omb omc oml omm omn omo oms on- onb onc onk onl onn ono ons oo- oob ooc ook ool oom oon ooo oos os- osb osc osk osl osm osn oso oss sbb sbc sbk sbl sbm sbn sbo sbs scb scc sck scl scm scn sco scs sk- skb skc skk skl skm sko sks slb slc slk sll slm sln slo sls smb smc smk sml smm smn smo sms snb snc snk snl snm snn sno sns sob soc sok sol som son soo sos ss- ssb ssc ssk ssl ssm ssn sso sss