bbb bbc bbm bbo bbs bbt bcb bcc bcm bco bcs bct bmb bmc bmm bmo bms bmt bob boc bom boo bos bot bsb bsc bsm bso bss bst btb btc btm bto bts btt c-- cbb cbc cbm cbo cbs cbt ccb ccc ccm cco ccs cct cmb cmc cmm cmo cms cmt co- cob coc com coo cos cot csb csc csm cso css cst ctb ctc ctm cto cts ctt m-o mbb mbc mbm mbo mbs mbt mc- mcb mcc mcm mco mcs mct mmb mmc mmm mmo mms mmt mob moc mom moo mos mot msb msc msm mso mss mst mtb mtc mtm mto mts mtt ob- obb obc obm obo obs obt oc- ocb occ ocm oco ocs oct om- omb omc omm omo oms omt oo- oob ooc oom ooo oos oot os- osb osc osm oso oss ost ot- otb otc otm oto ots ott sbb sbc sbm sbo sbs sbt scb scc scm sco scs sct smb smc smm smo sms smt sob soc som soo sos sot ss- ssb ssc ssm sso sss sst stb stc stm sto sts stt tbb tbc tbm tbo tbs tbt tcb tcc tcm tco tcs tct tmb tmc tmm tmo tms tmt to- tob toc tom too tos tot tsb tsc tsm tso tss tst ttb ttc ttm tto tts ttt