c-- ccc cck ccm cco cct ckc ckm cko ckt cky cmc cmk cmm cmo cmt cmy co- coc cok com coo cot coy ctc ctk ctm cto ctt cty cyc cyk cym cyo cyt k-t kcc kck kcm kct kkc kkk kkm kkt kky kmc kmk kmm kmo kmt koc kok kom koo kot koy ktc ktk ktm kto ktt kyc kym kyo kyt m-o mc- mcc mck mcm mco mct mkc mkk mkm mko mkt mky mmc mmk mmm mmo mmt moc mok mom moo mot moy mtc mtk mtm mto mtt my- myc myk mym myo myt oc- occ ock ocm oco oct okc okk oko om- omc omm omo omt omy oo- ooc ook oom ooo oot ot- otc otk otm oto ott oyo tcc tck tcm tco tct tkc tkk tkm tko tkt tky tmc tmk tmm tmo tmt tmy to- toc tok tom too tot toy ttc ttk ttm tto ttt tty tyc tym tyo tyt ycc yco ycy ykk ykm ymc ymm ymo ymt yoc yok yom yoo yot yoy ytc ytk ytm yto ytt yyc yyt yyy