bbb bbd bbk bbm bbo bdb bdd bdk bdm bdo bkb bkk bkm bko bmb bmd bmk bmm bmo bob bod bok bom boo dbb dbd dbk dbm dbo ddb ddd ddk ddm ddo dkb dkk dkm dko dmb dmd dmk dmm dmo dob dod dok dom doo kbb kbd kbk kbm kbo kdb kdk kdm kdo kkb kkk kkm kmb kmd kmk kmm kmo kob kod kok kom koo m-o mbb mbd mbk mbm mbo mdb mdd mdk mdm mdo mkb mkd mkk mkm mko mmb mmd mmk mmm mmo mob mod mok mom moo ob- obb obd obk obm obo odb odd odm odo okb okd okk oko om- omb omd omm omo oo- oob ood ook oom ooo