c-- ccc ccd cco ccp cdc cdd cdo cdp cdy co- coc cod coo cop coy cpc cpd cpo cpp cyc cyd cyo cyp dcc dcd dco dcp ddc ddd ddo ddp ddy doc dod doo dop doy dpc dpd dpo dpp dy- dyc dyd dyo dyp dyy oc- occ ocd oco ocp odc odd odo odp oo- ooc ood ooo oop op- opc opd opo opp opy oyd oyo p-p pcc pcd pco pcp pdc pdd pdo pdp poc pod poo pop poy ppc ppd ppo ppp py- pyc pyd pyo ycc ycd yco ycp ycy ydo ydy yoc yod yoo yop yoy ypd ypo yyc yyy