c-- ccc ccm ccn cco cmc cmm cmn cmo cmy cn- cnc cnm cnn cno cny co- coc com con coo coy cyc cym cyn cyo m-o mc- mcc mcm mcn mco mmc mmm mmn mmo mnc mnm mnn mno moc mom mon moo moy my- myc mym myn myo ncc ncm ncn nco nmc nmm nmn nmo nnc nnm nnn nno no- noc nom non noo noy nyc nym nyn nyo nyy oc- occ ocm ocn oco om- omc omm omn omo omy on- onc onn ono ony oo- ooc oom oon ooo oyo ycc yco ycy ymc ymm ymo ynn yny yoc yom yon yoo yoy yyc yyy