-ol bbb bbc bbl bbm bbn bbo bcb bcc bcl bcm bcn bco blb blc bll blm bln blo bmb bmc bml bmm bmn bmo bnb bnc bnl bnn bno bob boc bol bom bon boo c-- cbb cbc cbl cbm cbn cbo ccb ccc ccl ccm ccn cco cl- clb clc cll clm cln clo cmb cmc cml cmm cmn cmo cn- cnb cnc cnl cnm cnn cno co- cob coc col com con coo lbb lbc lbl lbm lbo lcb lcc lcl lcm lcn lco llb llc lll llm lln llo lmb lmc lml lmm lmn lmo lnb lnc lnl lnm lnn lno lob loc lol lom lon loo m-o mbb mbc mbl mbm mbo mc- mcb mcc mcl mcm mcn mco mlb mlc mll mlm mln mlo mmb mmc mml mmm mmn mmo mnb mnc mnl mnm mnn mno mob moc mol mom mon moo nbb nbc nbl nbm nbn nbo ncb ncc ncl ncm ncn nco nlb nlc nll nlm nln nlo nmb nmc nml nmm nmn nmo nnb nnc nnl nnm nnn nno no- nob noc nol nom non noo ob- obb obc obl obm obn obo oc- ocb occ ocl ocm ocn oco olb olc oll olm oln olo om- omb omc oml omm omn omo on- onb onc onl onn ono oo- oob ooc ool oom oon ooo