-ol bbb bbc bbl bbm bbn bbo bbs bcb bcc bcl bcm bcn bco bcs blb blc bll blm bln blo bls bmb bmc bml bmm bmn bmo bms bnb bnc bnl bnn bno bns bob boc bol bom bon boo bos bsb bsc bsl bsm bsn bso bss c-- cbb cbc cbl cbm cbn cbo cbs ccb ccc ccl ccm ccn cco ccs cl- clb clc cll clm cln clo cls cmb cmc cml cmm cmn cmo cms cn- cnb cnc cnl cnm cnn cno cns co- cob coc col com con coo cos csb csc csl csm csn cso css lbb lbc lbl lbm lbo lbs lcb lcc lcl lcm lcn lco lcs llb llc lll llm lln llo lls lmb lmc lml lmm lmn lmo lms lnb lnc lnl lnm lnn lno lns lob loc lol lom lon loo los lsb lsc lsl lsm lsn lso lss m-o mbb mbc mbl mbm mbo mbs mc- mcb mcc mcl mcm mcn mco mcs mlb mlc mll mlm mln mlo mls mmb mmc mml mmm mmn mmo mms mnb mnc mnl mnm mnn mno mns mob moc mol mom mon moo mos msb msc msl msm msn mso mss nbb nbc nbl nbm nbn nbo nbs ncb ncc ncl ncm ncn nco ncs nlb nlc nll nlm nln nlo nls nmb nmc nml nmm nmn nmo nms nnb nnc nnl nnm nnn nno nns no- nob noc nol nom non noo nos nsb nsc nsl nsm nsn nso nss ob- obb obc obl obm obn obo obs oc- ocb occ ocl ocm ocn oco ocs olb olc oll olm oln olo ols om- omb omc oml omm omn omo oms on- onb onc onl onn ono ons oo- oob ooc ool oom oon ooo oos os- osb osc osl osm osn oso oss sbb sbc sbl sbm sbn sbo sbs scb scc scl scm scn sco scs slb slc sll slm sln slo sls smb smc sml smm smn smo sms snb snc snl snm snn sno sns sob soc sol som son soo sos ss- ssb ssc ssl ssm ssn sso sss