c-- ccc ccd cch cco ccp cdc cdd cdh cdo cdp ch- chc chd chh cho chp co- coc cod coh coo cop cpc cpd cph cpo cpp dcc dcd dco dcp ddc ddd ddh ddo ddp dh- dhc dhd dhh dho dhp doc dod doh doo dop dpc dpd dph dpo dpp hcc hcd hch hco hcp hdc hdd hdh hdo hdp hhc hhd hhh hho hhp hoc hod hoh hoo hop hpc hpd hph hpo hpp oc- occ ocd och oco ocp odc odd odh odo odp ohc ohd ohh oho ohp oo- ooc ood ooh ooo oop op- opc opd oph opo opp p-p pcc pcd pch pco pcp pdc pdd pdh pdo pdp phc phd pho php poc pod poh poo pop ppc ppd pph ppo ppp