c-- ccc cck ccm cco ccp ckc ckm cko cmc cmk cmm cmo cmp co- coc cok com coo cop cpc cpk cpm cpo cpp kcc kck kcm kcp kkc kkk kkm kkp kmc kmk kmm kmo kmp koc kok kom koo kop kpc kpk kpm kpo kpp m-o mc- mcc mck mcm mco mcp mkc mkk mkm mko mkp mmc mmk mmm mmo mmp moc mok mom moo mop mpc mpk mpm mpo mpp oc- occ ock ocm oco ocp okc okk oko okp om- omc omm omo omp oo- ooc ook oom ooo oop op- opc opk opm opo opp p-p pcc pck pcm pco pcp pkc pkm pko pkp pmc pmk pmm pmo pmp poc pok pom poo pop ppc ppk ppm ppo ppp