c-- ccc cck ccm ccn cco ckc ckm cko cmc cmk cmm cmn cmo cn- cnc cnm cnn cno co- coc cok com con coo kcc kck kcm kcn kkc kkk kkm kkn kmc kmk kmm kmo kn- knc knk knm knn kno koc kok kom kon koo m-o mc- mcc mck mcm mcn mco mkc mkk mkm mkn mko mmc mmk mmm mmn mmo mnc mnk mnm mnn mno moc mok mom mon moo ncc nck ncm ncn nco nkc nkk nkm nkn nko nmc nmk nmm nmn nmo nnc nnk nnm nnn nno no- noc nok nom non noo oc- occ ock ocm ocn oco okc okk oko om- omc omm omn omo on- onc onk onn ono oo- ooc ook oom oon ooo