-ol bbb bbc bbl bbm bbo bbs bcb bcc bcl bcm bco bcs blb blc bll blm blo bls bmb bmc bml bmm bmo bms bob boc bol bom boo bos bsb bsc bsl bsm bso bss c-- cbb cbc cbl cbm cbo cbs ccb ccc ccl ccm cco ccs cl- clb clc cll clm clo cls cmb cmc cml cmm cmo cms co- cob coc col com coo cos csb csc csl csm cso css lbb lbc lbl lbm lbo lbs lcb lcc lcl lcm lco lcs llb llc lll llm llo lls lmb lmc lml lmm lmo lms lob loc lol lom loo los lsb lsc lsl lsm lso lss m-o mbb mbc mbl mbm mbo mbs mc- mcb mcc mcl mcm mco mcs mlb mlc mll mlm mlo mls mmb mmc mml mmm mmo mms mob moc mol mom moo mos msb msc msl msm mso mss ob- obb obc obl obm obo obs oc- ocb occ ocl ocm oco ocs olb olc oll olm olo ols om- omb omc oml omm omo oms oo- oob ooc ool oom ooo oos os- osb osc osl osm oso oss sbb sbc sbl sbm sbo sbs scb scc scl scm sco scs slb slc sll slm slo sls smb smc sml smm smo sms sob soc sol som soo sos ss- ssb ssc ssl ssm sso sss