c-- ccc cck ccm cco cct ckc ckm cko ckt cmc cmk cmm cmo cmt co- coc cok com coo cot ctc ctk ctm cto ctt k-t kcc kck kcm kct kkc kkk kkm kkt kmc kmk kmm kmo kmt koc kok kom koo kot ktc ktk ktm kto ktt m-o mc- mcc mck mcm mco mct mkc mkk mkm mko mkt mmc mmk mmm mmo mmt moc mok mom moo mot mtc mtk mtm mto mtt oc- occ ock ocm oco oct okc okk oko om- omc omm omo omt oo- ooc ook oom ooo oot ot- otc otk otm oto ott tcc tck tcm tco tct tkc tkk tkm tko tkt tmc tmk tmm tmo tmt to- toc tok tom too tot ttc ttk ttm tto ttt