c-- ccc ccd ccn cco cdc cdd cdn cdo cdy cn- cnc cnd cnn cno cny co- coc cod con coo coy cyc cyd cyn cyo dcc dcd dcn dco ddc ddd ddn ddo ddy dnc dnd dnn dno dny doc dod don doo doy dy- dyc dyd dyn dyo dyy ncc ncd ncn nco ndc ndd ndn ndo ndy nnc nnn nno no- noc nod non noo noy nyc nyd nyn nyo nyy oc- occ ocd ocn oco odc odd odn odo on- onc ond onn ono ony oo- ooc ood oon ooo oyd oyo ycc ycd yco ycy ydn ydo ydy ynd ynn yny yoc yod yon yoo yoy yyc yyy