c-- ccc cck ccm cco ccs cct ckc ckm cko cks ckt cmc cmk cmm cmo cms cmt co- coc cok com coo cos cot csc csk csm cso css cst ctc ctk ctm cto cts ctt k-t kcc kck kcm kcs kct kkc kkk kkm kks kkt kmc kmk kmm kmo kms kmt koc kok kom koo kos kot ksc ksk ksm kso kss kst ktc ktk ktm kto kts ktt m-o mc- mcc mck mcm mco mcs mct mkc mkk mkm mko mks mkt mmc mmk mmm mmo mms mmt moc mok mom moo mos mot msc msk msm mso mss mst mtc mtk mtm mto mts mtt oc- occ ock ocm oco ocs oct okc okk oko oks om- omc omm omo oms omt oo- ooc ook oom ooo oos oot os- osc osk osm oso oss ost ot- otc otk otm oto ots ott scc sck scm sco scs sct sk- skc skk skm sko sks skt smc smk smm smo sms smt soc sok som soo sos sot ss- ssc ssk ssm sso sss sst stc stk stm sto sts stt tcc tck tcm tco tcs tct tkc tkk tkm tko tks tkt tmc tmk tmm tmo tms tmt to- toc tok tom too tos tot tsc tsk tsm tso tss tst ttc ttk ttm tto tts ttt