bbb bbc bbm bbs bbt bcb bcc bcm bcs bct bmb bmc bmm bms bmt bsb bsc bsm bss bst btb btc btm bts btt c-- cbb cbc cbm cbs cbt ccb ccc ccm ccs cct cmb cmc cmm cms cmt csb csc csm css cst ctb ctc ctm cts ctt mbb mbc mbm mbs mbt mc- mcb mcc mcm mcs mct mmb mmc mmm mms mmt msb msc msm mss mst mtb mtc mtm mts mtt sbb sbc sbm sbs sbt scb scc scm scs sct smb smc smm sms smt ss- ssb ssc ssm sss sst stb stc stm sts stt tbb tbc tbm tbs tbt tcb tcc tcm tcs tct tmb tmc tmm tms tmt tsb tsc tsm tss tst ttb ttc ttm tts ttt