-ol bbb bbl bbm bbo bbs blb bll blm blo bls bmb bml bmm bmo bms bob bol bom boo bos bsb bsl bsm bso bss lbb lbl lbm lbo lbs llb lll llm llo lls lmb lml lmm lmo lms lob lol lom loo los lsb lsl lsm lso lss m-o mbb mbl mbm mbo mbs mlb mll mlm mlo mls mmb mml mmm mmo mms mob mol mom moo mos msb msl msm mso mss ob- obb obl obm obo obs olb oll olm olo ols om- omb oml omm omo oms oo- oob ool oom ooo oos os- osb osl osm oso oss sbb sbl sbm sbo sbs slb sll slm slo sls smb sml smm smo sms sob sol som soo sos ss- ssb ssl ssm sso sss