bbb bbh bbm bbo bbs bhb bhh bhm bho bhs bmb bmh bmm bmo bms bob boh bom boo bos bsb bsh bsm bso bss hbb hbh hbm hbo hbs hhb hhh hhm hho hhs hmb hmh hmm hmo hms hob hoh hom hoo hos hsb hsh hsm hss m-o mbb mbh mbm mbo mbs mhh mhm mho mhs mmb mmh mmm mmo mms mob moh mom moo mos msb msh msm mso mss ob- obb obh obm obo obs ohh ohm oho ohs om- omb omh omm omo oms oo- oob ooh oom ooo oos os- osb osh osm oso oss sbb sbh sbm sbo sbs sh- shb shh shm sho shs smb smh smm smo sms sob soh som soo sos ss- ssb ssh ssm sso sss