-ol bbb bbc bbk bbl bbm bbo bcb bcc bck bcl bcm bco bkb bkc bkk bkl bkm bko blb blc blk bll blm blo bmb bmc bmk bml bmm bmo bob boc bok bol bom boo c-- cbb cbc cbk cbl cbm cbo ccb ccc cck ccl ccm cco ckb ckc ckm cko cl- clb clc clk cll clm clo cmb cmc cmk cml cmm cmo co- cob coc cok col com coo kbb kbc kbk kbl kbm kbo kcb kcc kck kcl kcm kkb kkc kkk kkl kkm kl- klb klc klm klo kmb kmc kmk kml kmm kmo kob koc kok kol kom koo lbb lbc lbk lbl lbm lbo lcb lcc lck lcl lcm lco lkb lkl llb llc llk lll llm llo lmb lmc lmk lml lmm lmo lob loc lok lol lom loo m-o mbb mbc mbk mbl mbm mbo mc- mcb mcc mck mcl mcm mco mkb mkc mkk mkl mkm mko mlb mlc mlk mll mlm mlo mmb mmc mmk mml mmm mmo mob moc mok mol mom moo ob- obb obc obk obl obm obo oc- ocb occ ock ocl ocm oco okb okc okk okl oko olb olc olk oll olm olo om- omb omc oml omm omo oo- oob ooc ook ool oom ooo