bbb bbm bbo bbs bmb bmm bmo bms bmz bob bom boo bos boz bsb bsm bso bss bzo bzs bzz m-o mbb mbm mbo mbs mmb mmm mmo mms mmz mob mom moo mos moz msb msm mso mss mzb mzm ob- obb obm obo obs om- omb omm omo oms omz oo- oob oom ooo oos os- osb osm oso oss ozm ozo ozs ozz sbb sbm sbo sbs smb smm smo sms smz sob som soo sos soz ss- ssb ssm sso sss ssz zbb zbm zbs zmb zmm zms zo- zob zom zoo zos zsm zsz zzs zzz