c-- ccc cce cch cco ccp ce- cec cee ceh ceo cep ch- chc che chh cho chp co- coc coe coh coo cop cpc cpe cph cpo cpp ec- ecc ece ech eco eec eee eeo eep ehc ehe ehh eho ehp eo- eoc eoe eoh eoo eop ep- epc epe eph epo epp hcc hce hch hco hcp he- hec hee heh heo hep hhc hhe hhh hho hhp hoc hoe hoh hoo hop hpc hpe hph hpo hpp oc- occ och oco ocp oec oee oeh oeo oep ohc ohe ohh oho ohp oo- ooc ooh ooo oop op- opc ope oph opo opp p-p pcc pce pch pco pcp pec pee peh peo pep phc phe pho php poc poe poh poo pop ppc ppe pph ppo ppp