-ol bbb bbc bbk bbl bbm bbn bbo bcb bcc bck bcl bcm bcn bco bkb bkc bkk bkl bkm bkn bko blb blc blk bll blm bln blo bmb bmc bmk bml bmm bmn bmo bnb bnc bnk bnl bnn bno bob boc bok bol bom bon boo c-- cbb cbc cbk cbl cbm cbn cbo ccb ccc cck ccl ccm ccn cco ckb ckc ckm cko cl- clb clc clk cll clm cln clo cmb cmc cmk cml cmm cmn cmo cn- cnb cnc cnl cnm cnn cno co- cob coc cok col com con coo kbb kbc kbk kbl kbm kbn kbo kcb kcc kck kcl kcm kcn kkb kkc kkk kkl kkm kkn kl- klb klc klm klo kmb kmc kmk kml kmm kmo kn- knc knk knl knm knn kno kob koc kok kol kom kon koo lbb lbc lbk lbl lbm lbo lcb lcc lck lcl lcm lcn lco lkb lkl llb llc llk lll llm lln llo lmb lmc lmk lml lmm lmn lmo lnb lnc lnk lnl lnm lnn lno lob loc lok lol lom lon loo m-o mbb mbc mbk mbl mbm mbo mc- mcb mcc mck mcl mcm mcn mco mkb mkc mkk mkl mkm mkn mko mlb mlc mlk mll mlm mln mlo mmb mmc mmk mml mmm mmn mmo mnb mnc mnk mnl mnm mnn mno mob moc mok mol mom mon moo nbb nbc nbk nbl nbm nbn nbo ncb ncc nck ncl ncm ncn nco nkc nkk nkm nkn nko nlb nlc nlk nll nlm nln nlo nmb nmc nmk nml nmm nmn nmo nnb nnc nnk nnl nnm nnn nno no- nob noc nok nol nom non noo ob- obb obc obk obl obm obn obo oc- ocb occ ock ocl ocm ocn oco okb okc okk okl oko olb olc olk oll olm oln olo om- omb omc oml omm omn omo on- onb onc onk onl onn ono oo- oob ooc ook ool oom oon ooo