bbb bbc bbh bbk bbm bbo bcb bcc bch bck bcm bco bhb bhc bhh bhk bhm bho bkb bkc bkk bkm bko bmb bmc bmh bmk bmm bmo bob boc boh bok bom boo c-- cbb cbc cbh cbk cbm cbo ccb ccc cch cck ccm cco ch- chb chc chh chk chm cho ckb ckc ckh ckm cko cmb cmc cmh cmk cmm cmo co- cob coc coh cok com coo hbb hbc hbh hbk hbm hbo hcb hcc hch hck hcm hco hhb hhc hhh hhk hhm hho hkb hkh hkk hkm hko hmb hmc hmh hmk hmm hmo hob hoc hoh hok hom hoo kbb kbc kbh kbk kbm kbo kcb kcc kch kck kcm khh khk khm kho kkb kkc kkh kkk kkm kmb kmc kmh kmk kmm kmo kob koc koh kok kom koo m-o mbb mbc mbh mbk mbm mbo mc- mcb mcc mch mck mcm mco mhc mhh mhk mhm mho mkb mkc mkh mkk mkm mko mmb mmc mmh mmk mmm mmo mob moc moh mok mom moo ob- obb obc obh obk obm obo oc- ocb occ och ock ocm oco ohc ohh ohm oho okb okc okk oko om- omb omc omh omm omo oo- oob ooc ooh ook oom ooo