c-- ccc ccm cco ccp cmc cmm cmo cmp cmy co- coc com coo cop coy cpc cpm cpo cpp cyc cym cyo cyp m-o mc- mcc mcm mco mcp mmc mmm mmo mmp moc mom moo mop moy mpc mpm mpo mpp my- myc mym myo oc- occ ocm oco ocp om- omc omm omo omp omy oo- ooc oom ooo oop op- opc opm opo opp opy oyo p-p pcc pcm pco pcp pmc pmm pmo pmp poc pom poo pop poy ppc ppm ppo ppp py- pyc pym pyo ycc yco ycp ycy ymc ymm ymo yoc yom yoo yop yoy ypo yyc yyy